1
Part 2
This list of file types sets out to answer the common question "What is a file of type .x?" or "What is that file extension for?"
A file type is denoted by those letters that follow the last dot in a file name. These letters denote the type of file, and are also commonly known as a file extension. On Windows PCs the file extension may be hidden by Windows, but is still part of the file name.
This list of file types contains a list of file extensions together with a brief description of the type of file that the extension is associated with.





Computer 'N' file extensions
1. .n64 - Nintendo 64 Emulator ROM image. 
2. .na2 - Netscape Communicator address book. 
3. .nab - Novell Groupwise address book 
4. .nap - Napster Music security definition file. 
5. .nb - Nota Bene document file.
6. .nba - Nero BackItUp compressed archive.
7. .ncb - Visual Studio browse file.
8. .ncf - Netware command file.
9. .nch - Outlook express news items / Audio file / Virus.
10. .ndf - Secondary SQL Server data file./ NeoPlanet Browser file
11. .nds - Nintendo DS binary file./ Nintendo DS dumped game ROM file
12. .ndx - dBase non-maintained index file. Indexed file for most databases.
13. .nef - Digital camera RAW file format.
14. .nes - Nintendo Entertainment system ROM image.
15. .neta - Netica Bayesian network text file (opens with netica.exe).
16. .newsrc - Newsgroup source file.
17. .nfb - Nokia Phone (Fone) Book, backup file.
18. .nfo - Information file.
19. .ngf - Enterasys Networks NetSight file.
20. .ngg - Nokia and LogoManager file.
21. .nhf - Nero HFS-CD compilation or  a general Nero file
22. .nil - Norton guide online documentation
23. .nk2 - Microsoft Outlook Nickname file.
24. .nlb - Oracle 7 data file
25. .nld - ATI Radeon video driver file.
26. .nlm - Netware loadable module./ Nokia and LogoManager file.
27. .nls - National language code page file.
28. .nmi - SwordSearcher file.
29. .nn - Nero CD file list.
30. .nol - Nokia and LogoManager file.
31. .non - LucasArts Star Wars - Tie fighter mouse options file.
32. .now - Extension commonly used for readme text files.
33. .npk - MicroTik RouterOS upgrade package / n-Track Studio temporary file.
34. .nra - Nero Audio CD file.
35. .nrb - Nero CD-ROM boot file.
36. .nrg - Nero CD image.
37. .ns - NSwin project file / NetStumbler log file.
38. .ns2 - Lotus Notes 2 database,
39. .ns5 - Lotus Notes Domino file,
40. .nsf - Lotus notes database file.
41. .nso - NetStudio easy web graphics file.
42. .nt - Windows NT startup file.
43. .ntf - National Imagery Transmission format.
44. .num - File used with some Software Manufactures to store technical support numbers or other phone numbers, should be readable from DOS and or Windows.
45. .nunit - NUnit Test Project file.
46. .nut - Nutricalc file.
47. .nwc - NoteWorthy composer music score / NavisWorks Cache file.
48. .nws - Newsgroup article file / Newsmaster II data file.
49. .nzb - Newzbin file.


Computer 'O' file extensions
1. .o - Object file.
2. .obj - Object file (Windows)
3. .oca - VB cache file./ Control Typelib Cache.
4. .ocx - ActiveX control./ Object Linking and Embedding (OLE) control extension.
5. .od - Mascopt graph request file.
6. .ods - OpenOffice spreadsheet / Outlook Express mailbox.
7. .odt - OpenDocument Text document / Virtual Reality Explorer Kit Object file.
8. .oeb - Open eBook file.
9. .oft - Outlook form template file.
10. .ogg - Ogg Vorbis music file.
11. .ogm - A Ogg Media File, OGM files are movie files.
12. .olb - Object library.
13. .old - Generic old or backup file./ Used for backups of important files in case they are improperly updated or deleted.
14. .ole - Object Linking and Embedding object file.
15. .oli - Olivetti text file.
16. .opf - FlipBook definition file
17. .opt - Visual studio workspace information file.
18. .orf - Olympus Raw File / Descent 3 Outrage Room Format file / Override Rules File./ Digital camera RAW file format.
19. .ori - Original file.
20. .otl - A Z-soft type foundry font file and other program files template file.
21. .ost - Exchange offline storage file.
22. .ovl - Driveimage setup file / Overlay file.
23. .qtif - Apple Macintosh image file.

Computer 'P' file extensions
1. .p - Progress 4GL code file / Pascal source file.
2. .p12 - Personal Information Exchange file.
3. .pab - Microsoft Outlook address book.
4. .pak - WAD file./ Compressed file extracted and used with various compression utilities. Often many games will have large .PAK files that contain a lot of the games information.
5. .pal - Generic colour palette files / Paint Shop Pro colour palette file / PiXCL palette file.
6. .paq8o10t - PAQ compressed archive.
7. .par - Windows 3.x swap file.
8. .part - Partial downloaded file.
9. .pas - Pascal source file.
10. .pb - WinFax Pro phone book file.
11. .pbd - PowerBuilder dynamic library / Faxit phone book file.
12. .pbf - Turtle Beach Pinnacle bank file.
13. .pbi - Profiler binary input file.
14. .pbk - Microsoft phonebook file.
15. .pbl - PowerBuilder library file.
16. .pbm - Portable bitmap image file./ Unix portable bitmap fuke.
17. .pbo - Profiler binary output.
18. .pbr - PowerBuilder resource.
19. .pbt - Profiler binary table.
20. .pcd - Kodak photo CD image.
21. .pch - Precompiled header file.
22. .pce - Eudora mail file.
23. .pcl - Printer Control Language file.
24. .pct - Macintosh drawing file.
25. .pcx - PC Paintbrush image file./ Microsoft Paint & PC Paintbrush Windows/DOS.
26. .pd - Paradox database file / Perl data file.
27. .pda - Bitmap graphic file.
28. .pdb - Program Database / Palm document./ TACT data file.
29. .pdd - Adobe PhotoDeluxe image file.
30. .pde - PowerDesk encrypted file or folder / Principalm data export file / Processing development environment sketchbook file / Pathology data exchange file / Arduino script file.
31. .pdf - Portable Document Format / Printer description file./ Adobe Acrobat Reader file.
32. .pdg - MetaCAM part file.
33. .pdl - Borland C++ project description language file.
34. .pds - Graphic file / Pldasm source code file.
35. .pdv - Paintbrush printer driver.
36. .pdw - Professional Draw document.
37. .pef - Digital camera RAW file format.
38. .pf - Windows Prefetch file/ Short for Private File, .PF is a compressed file extracted and used with various compression utilities.
39. .pfx - PostEffect plug-in file (Animation Master) / Personal Information Exchange file.
40. .pgm - Portable Greymap image file.
41. .pgt - Compiled Tags database / Sothink Glanda Widget Tools File.
42. .php - PHP script file / Server side scripting file.
43. .pic - Lotus graphic file / Micrografx Draw! file / Pegasus image file / SoftImage frame./ Picture / Viewer Frame Class.
44. .pict - Apple Mac internal picture format file.
45. .pif - Executable / graphics file / compressed archive./ Program Information File that configures a DOS app to run efficiently in windows.
46. .pig - Descent texture data.
47. .pjp - JPEG graphics file.
48. .pjpeg - JPEG graphics file.
49. .pjf - Paintjet soft font file.
50. .pk7 - Signed Electronic bill.
51. .pkg - Apple Newton File, MicroSim PCBoard External ASCII file, Microsoft Developer Studio Application File, Next installer script
52. .pkl - Packing list file.
53. .pl - Perl script./ Harvard palette file or PERL program file.
54. .pl3 - Harvard chart palette
55. .plb - Foxpro library / LogoShow Screensaver file
56. .plc - Lotus Add-in
57. .pld - PLD2 source file
58. .plg - Visual Studio build log./ REND386 / AVRIL file
59. .pli - Oracle 7 data description
60. .plist - Property list file / Preference file / Handbrake Presets file.
61. .pll - Prelinked library
62. .plm - DisorderTracker2 module
63. .pln - WordPerfect spreadsheet file
64. .plr - Descent player file.
65. .pls - Generic playlist file./ WinAmp MPEG playlist file / DisorderTracker 2 Sample file / Shoutcast file / MYOB data file
66. .plt - Plot file./ AutoCAD HPGL vector graphic plotter file / Gerber sign-making software file / Betley's CAD Microstation driver configuration for plotting
67. .ply - Poly model file (Animation Master)./ Autodesk polygon.
68. .pm - Perl Module / Pegasus mail file.
69. .pm3 - PageMaker 3.0 document.
70. .pm4 - PageMaker 4.0 document.
71. .pm5 - PageMaker 5.0 document
72. .pm6 - PageMaker 6.0 document
73. .pm$ - Pegasus mail temporary file.
74. .pml - Process Monitor log file / PADGen program information file.
75. .pmd - Published map document.
76. .pms - Pegasus mail signature file.
77. .png - Graphics file./ Bitmapped image. See PNG definition for additional information.
78. .pof - Descent 1 3D data file.
79. .pog - Descent texture data.
80. .pol - System policy file.
81. .pot - PowerPoint design template.
82. .pp - Compressed archive file.
83. .pp4 - Picture Publisher.
84. .pp5 - Picture Publisher.
85. .ppa - Power Point Add-in.
86. .ppb - WordPerfect Print preview button bar.
87. .ppd - PostScript printer description / PowerPoint slide show.
88. .ppf  - Turtle Beach Pinnacle program file.
89. .ppi - Microsoft PowerPoint graphic file.
90. .ppl - Pascal File or Harvard (now Serif) Polaroid Palette Plus ColorKey Driver.
91. .ppm - Portable pixelmap image./ PBM Portable Pixelmap Graphic.
92. .ppo - Clipper Preprocessor Output.
93. .ppp - Page Plus file / AIRSAR log file / Enfocus PDF Profile. / Serif PagePlus Publication.
94. .pps - PowerPoint slide show / Ping Plotter file.
95. .ppt - PowerPoint presentation file.
96. .ppx - Serif PagePlus publication.
97. .ppz - PowerPoint animation file / Packed PowerPoint file.
98. .prb - xyAlgebra probabilities file / DMSolver problem file / Silicon Explorer Probe file / Phat probabilities file.
99. .pre - Render preset file (Animation Master).
100. .prf - Outlook Profile file / ClarisWorks Preferences File / Macromedia Director Preferences file.
101. .prg - FoxPro or dBASE source file.
102. .prj - PC Guard project file / Animation Master project file.
103. .prn - Print file.
104. .pro - Pro/ENGINEER configuration file / Euphoria profile listing file.
105. .pro2 - Euphoria time profile listing file.
106. .prt - Pro ENGINEER part file.
107. .ps - PostScript file.
108. .ps2 - File to support the Micro Channel Architecture in 386 Enhanced mode.
109. .psd - Native Adobe Photoshop format. / Adobe Photoshop image file.
110. .psp - Paint Shop Pro image.
111. .pst - Personal folder file (Microsoft Outlook) / PostEffect file (Animation Master)./ Post Office Box file used with Microsoft Outlook usually mailbox.pst unless named otherwise.
112. .pub - Microsoft Publisher document.
113. .py - Python source file.
114. .pwa - Password agent file.
115. .pwd - Password file.
116. .pwf - ProCite Workforms
117. .pwl - Windows (9x) password file. / Password file used in Windows 95 and Windows 98 is stored in the Windows directory.
118. .pwp - Photoworks image file.
119. .pwz - PowerPoint wizard.
120. .px - Paradox database index file. / Paradox primary database index file.
121. .pxl - Pocket Excel worksheet file.
122. .py - Python script file.
123. .pyc - Compiled Python script file.
124. .pyd - Python binary extension for Windows.
125. .pyw - Python GUI script for Windows.
126. .pz2 - Curious Labs Poser pose file.
127. .pz3 - Curious Labs Poser document.
128. .pza - MGI PhotoSuite album file.
129. .pzd - Pizazz Plus default settings file.
130. .pzl - Puzzle file or Load Runner game puzzle file.
131. .pzo - Pizazz Plus overlay file.
132. .pzp - MGI PhotoSuite project file.
133. .pzs - Pizazz Plus settings file.
134. .pzt - Pizazz Plus transfer file.
135. .pzx - Pizazz Plus swap file.

Computer 'Q' file extensions
1. .qh - Simplex database query file.
2. .qic - Windows backup file.
3. .qif - Quicken import file.
4. .qt - QuickTime movie.
5. .qxd - QuarkXPress document.
6. .qxl - Quark Xpress element library.
7. .qxp - QuarkXPress document.
8. .qxt - Quark Xpress template file

Computer 'R' file extensions
1. .r - Pegasus Mail resource file
2. .r00 - Part of a RAR archive
3. .r01 - Part of a RAR archive.
4. .r02 - Part of a RAR archive.
5. .r03 - Part of a RAR archive.
6. .r04 - Part of a RAR archive.
7. .r05 - Part of a RAR archive.
8. .ra - RealAudio file.
9. .raf - Digital camera RAW file format.
10. .ram - RealAudio meta file.
11. .rar - Compressed file.
12. .ras - Sun raster graphic files.
13. .raw - Raw binary image file.
14. .rc - Resource file./ Emacs configuration file, C++ resource complier script file, or a Mozilla subscription information file.
15. .rd1 - Descent registered level file
16. .rd3 - Ray Dream designer graphics file / CorelDraw 3D file
17. .rd4 - Ray Dream designer graphics file
18. .rd5 - Ray Dream designer graphics file
19. .rdb - TrueVector rules database
20. .rdf - Resource Description Framework file. / Chromeleon report definition
21. .rdi - Remote desktop connection file.
22. .rdl - Descent 1 level file./ Descent registered level file / RadioDestiny radio stream
23. .rdlc - Client Report Definition file.
24. .rdo - Rawster document object.
25. .rdx - Reflex data file
26. .rec - Rational Robot test script / ArcServe backup file / Audio-visual media file / RSA SecurID file / ProMash recipe file./ Sound file used with Windows Sound Recorder.
27. .res - Resource file.
28. .resx - .Net resource file.
29. .reg - Windows registry file.
30. .rgb - Silicon Graphics file.
31. .rh - Simplex database report.
32. .rl2 - Descent 2 level file.
33. .rle - Run Length Encoded file. See RLE definition for additional information.
34. .rm - RealAudio video file.
35. .rmi - Microsoft RMID sound file.
36. .rom - MO5 cartridge image file.
37. .rpb - Automotive diagnostic file.
38. .rpd - Rapidfile database
39. .rpm - RedHat package manager.
40. .rps - Delphi translation repository file / SamStock journal file.
41. .rpt - Crystal Report file./ Various Report file
42. .rsp - Response file / ODBC driver configuration file.
43. .rt - RealText file.
44. .rtd - RagTime data file.
45. .rtf - Rich text file.
46. .rtx - Rich text file.
47. .ru - Javasoft JRE lib file / Media file.
48. .rw5 - TDS Raw Data file.
49. .rwz - Microsoft Outlook rules wizard file

Computer 'S' file extensions
1. .s7i - Seed7 library or include file.
2. .sas - SAS program. 
3. .sas7bdat - SAS data set file.
4. .sas7bvew - SAS data set view file.
5. .sav - Generic backup file / Generic save file / Game save file / SPSS data file.
6. .sbh - Rational robot header file.
7. .sbl - Graphic symbol library file / Rational robot language file / Softbridge Basic language script.
8. .sbn - Driver 3 game file / ArcView spatial index file.
9. .sbr - Source browse file.
10. .sbx - Adobe Illustrator Tsume File / ArcView spatial index file.
11. .sc2 - Maps used in Sim City 2000.
12. .sca - Scala script file.
13. .scb - Published Scala script file / Scribble document file / AI scripting file / Supercard eBook file.
14. .scc - Source safe integration file.
15. .scf - Windows Explorer Command file / DNA Baser file / LabView tag file.
16. .sch - Scheme file (Animation Master).
17. .scm - ICQ Sound Compressed Sound Scheme file.
18. .scp - Dialup Networking script file.
19. .scr - Screen saver / AutoCAD script file/ Source files for the .INI files, or sometimes may be used as screen savers.
20. .scs - SuperTable data file.
21. .sct - Windows script component.
22. .sd - Sound Designer I audio file
23. .sd2 - Sound Designer II flattened file / Sound Designer II data fork file / SAS database file
24. .sd7 - Seed7 source file / SAS dataset file.
25. .sda - StarOffice drawing file / SoftCuisine data archive
26. .sdc - StarOffice spreadsheet
27. .sdd - StarOffice presentation
28. .sdf - Standard data format file / Schedule data file / System file format / Autodesk mapguide spatial data file
29. .sdk - Roland S-series floppy disk image
30. .sdl - SmartDraw library
31. .sdn - Small archive
32. .sdr - SmartDraw drawing
33. .sds - Open Office chart file / Star Office chart file / MIDI Sample dump file / Digital Space browser link / Smart Diary Suite database./ StarOffice chart file / Raw MIDI sample dump standard file
34. .sdt - SmartDraw template
35. .sdv - Semicolon divided value file
36. .sdw - Sun Microsystems StarOffice file document file similar to the Microsoft Office .DOC file.
37. .sdx - MIDI sample dump standard files compacted by SDX
38. .sea - StuffIt file./ Compressed file used with Apple Macintosh computers and Stuffit that is extracted and used with various compression utilities.
39. .sff - Structured Fax File.
40. .sfw - Seattle Film Works file.
41. .sgi - Silicon Graphics file.
42. .sgml - Standard generalised mark-up language file.
43. .sh - Shell script./ Archive file
44. .sh3 - Harvard (now Serif) presentation file
45. .shb - Corel Background file or Microsoft Shell scrap object
46. .shd - Shader plugin (Animation Master).
47. .shg - Hotspot Editor Hypergraphic
48. .shk - Apple Macintosh Compressed Archive file
49. .shm - WordPerfect Shell Macro
50. .shn - Compressed audio file.
51. .shp - ArcView shapefile / AutoCAD shape definition file./ 3D Studio Shapes File / other 3D related file
52. .shr - Archive file
53. .shs - Scrap object file./ Shell scrap object file
54. .shtml - HTML file supporting server side includes./ See our SHTML definition page.
55. .shw - Corel presentation / WordPerfect Slide Show / Show File.
56. .shx - ArcView index file / AutoCAD shape file.
57. .sid - MrSID file./ LizardTech's SID wavelet file.
58. .sif - Windows unattended install answer file.
59. .sis - Symbian/EPOC OS installation file.
60. .sit - Macintosh StuffIt archive./ A compressed file often used with Apple Macintosh computers and Stuffit that is extracted and used with various compression utilities.
61. .sitx - A compressed file often used with Apple Macintosh computers and Stuffit that is extracted and used with various compression utilities
62. .sl8 - SIMUL8 simulation file.
63. .slk - Symbolic link format file./ Multiplan file. / Microsoft Excel symbolic link.
64. .sln - Visual Studio solution object file.
65. .smd - SEGA mega drive ROM file.
66. .smi - RealPlayer file.
67. .smil - A synchronized multimedia media file associated with Real player.
68. .snd - Sound file./ Sound Clip file / Raw unsigned PCM data / AKAI MPC-series sample / NeXT sound / Macintosh sound resource file
69. .sng - Song file./ MIDI song
70. .snm - Netscape Mail
71. .sno - SNOBOL program file
72. .snp - Microsoft Access report snapshot./ Microsoft Access snapshot file, SQL Compare file, or a Snapview snapshot file.
73. .sol - Local Shared Object file (Flash).
74. .sos - DRS OMR decode instruction file.
75. .spd - A scalable font file.
76. .spo - SPSS output file.
77. .spp - Serif PhotoPlus image file.
78. .spr - Brother spreadsheet / Half-life sprite file.
79. .sps - SPSS syntax file / SyncBack profile file.
80. .sql - Structured Query Language file.
81. .sqm - Windows Live Messenger (Software Quality Metrics) Log File / Windows Live Mail log file / Operation Flashpoint mission file.
82. .srd - Supercube file.
83. .srf - ATL Server file / InfoCrafter document / Raster graphics file / Raw graphics file / Spectral Response Function data / SurfSaver file / Terragen™ Surface map file. / Digital camera RAW file format.
84. .srg - Self Registration File.
85. .srl - Local database file / Nintendo ROM dump file.
86. .srt - Subtitles file.
87. .ssa - Source Safe archive file.
88. .ssf - Show Shifter File.
89. .ssf.00 - Show Shifter file.
90. .ssf.01 - Show Shifter file.
91. .sta - FinePrint stationary file.
92. .stc - Open Office Calc template file.
93. .std - Open Office Draw template file.
94. .sti - Open Office Impress template file.
95. .stm - Exchange store file / Server side include / Server side includes / State transition diagram / Media file.
96. .str - String replacement file / DataPerfect file / Video game file.
97. .sts - Datapulse - CIM file.
98. .stw - OpenOffice Writer template file.
99. .stx - Santa Barbara Instrument Group file.
100. .sub - CloneCD sub channel data file.
101. .sum - Summary file.
102. .sun - Sun raster graphic files.
103. .suo - Visual Studio user options file.
104. .sv7 -  SAS data view file.
105. .svg - Scalable vector graphic file./ CAD file.
106. .svgz - Compressed scalable vector graphics file.
107. .svn - Subversion directory.
108. .switch - Secure package file.
109. .swf – Macromedia Flash file.
110. .swp - Swap file./ Extension used for the Windows Swap File usually Win386.Swp. This file is required by Windows and generally can grow very large in size sometimes up to several hundred megs. This file is used to swap information between currently running programs and or memory. If this file is deleted from the computer Windows will be unable to load and will need to be reinstalled.
111. .sxc - Open Office Calc file.
112. .sxd - Open Office Draw file.
113. .sxg - Open Office master document.
114. .sxi - Open Office Impress file.
115. .sxm - Open Office Math file.
116. .sxp - Open Office Presentation file.
117. .sxw - Open Office Writer document.
118. .syd - SYSTAT data file.
119. .syo - SYSTAT output file.
120. .sys - Windows system file./ System and peripheral drivers.

Computer 'T' file extensions
1. .tab - MapInfo table structure file.
2. .tar - tape archive compressed file./ Short for Tape ARchive, TAR files are a single file that usually contains multiple files. They are not compressed files, and are often used to group a collection of files. Additional information about TAR files can be found on our Linux / Unix tar command page.
3. .tar.gz/.tbz- A compressed file including the TAR compressed with gzip. 
4. .tbz2/.tgz - A compressed file including the TAR compressed with gzip.
5. .td - Simplex database table.
6. .tdf - Trace Definition File used with OS/2.
7. .tex - Latex file.
8. .tfw - ArcView (Tiff) world coordinates file.
9. .tga - Targa bitmap./ Targa file. Truevision Advanced Raster Graphic Adapter (TARGA).
10. .tgr - Tiger line file.
11. .th - Simplex database table header file.
12. .thm - Video thumbnail file.
13. .tif - TIFF file./ Tag Image Format that includes most 24-bit color.
14. .tiff - TIFF file.
15. .tlb - Type library file./ Remote automation truelib files / OLE type library / Visual C++ type library.
16. .tld - Tellix file.
17. .tle - NASA two-line element set.
18. .tlp - Microsoft project timeline fie.
19. .tlt - Trellix web design file.
20. .tlx - Trellix data file.
21. .tmb - Thumbnail image file.
22. .tmd - Temporary file.
23. .tmp - Temporary file.
24. .tod - JVC video clip file.
25. .topc - TopicCrunch SEO-project parameter set.
26. .tp - TPwin project file.
27. .tpc - 3D Topicscape inter-Topicscape topic link file.
28. .tpl - Generic template file / PHP template file.
29. .trb - Turbulence plugin (Animation Master).
30. .trm - Windows Terminal.
31. .trs - MicroGraphix file.
32. .tsv - Tab Separated Values file.
33. .ttf - True type font.
34. .tub - Paint Shop Pro picture tube file.
35. .tx - TX Text Control data file.
36. .txm - Text Control Demo file.
37. .txt - ASCII text file./ Text file that can be read from windows of from DOS by using the Edit, Type, or Edlin

Computer 'U' file extensions
1. .ucf - User Constraint File / Coordinate list file / WebEx Universal Communications file.
2. .udf - Uniqueness definition file.
3. .udl - Data link file.
4. .uha - UHARC compressed archive.
5. .uni - MikMod (UniMod) format file / Forcast Pro data file.
6. .unk - Unknown file type, sometimes used when a file is received that cannot be identified.
7. .unx - Text file generally associated with Unix.
8. .url - Internet shortcut file./ File used with some browsers such as Internet Explorer linking you to different web pages. Internet Shortcut.
9. .user - Visual Studio user options file.
10. .usr - User profile file for GuildFTPD
11. .utf - Ulead Video Studio subtitle file.
12. .uu - A uucode compressed file that is extracted and used with various compression utilities.
13. .uue - UU-encoded file./ A uucode compressed file that is extracted and used with various compression utilities.

Computer 'V' file extensions
1. .v01 - NT backup catalogue file.
2. .v64 - Nintendo emulation ROM image.
3. .vb - Visual Basic .NET source file.
4. .vba - vBase file
5. .pbd - ActiveX file
6. .vbe - VBScript encoded script file
7. .vbg - Visual Basic group project file
8. .vbk - VisualCADD backup file
9. .vbl - User license control file
10. .vbp - Visual Basic project file
11. .vbproj - Visual Basic .NET project file.
12. .vbr - Remote automation registration files
13. .vbs - Visual Basic script file. / Microsoft Visual Basic Script file for quick programs and in some cases can be used as a virus file.
14. .vbw - Visual Basic project workplace
15. .vbx - Visual Basic extension.
16. .vbz - Wizard launch file
17. .vc - VisiCalc Spreadsheet file.
18. .vcd - VisualCADD Drawing file.
19. .vbe - Natural MicroSystems voice file.
20. .vcf - vCard File / Vevi Configuration file.
21. .vcs - Microsoft Outlook vCalander file.
22. .vct - FoxPro class library.
23. .vcw - Microsoft Visual C++ workbench information file.
24. .vcx - FoxPro class library.
25. .vda - Targa bitmap
26. .vdd - Short for Virtual Device Driver.
27. .vdo - VDOScript file
28. .vdx - No such file extension - Likely you meant to .vxd
29. .vfx - Volumetric effect plugin (Animation Master).
30. .vgc - ViziGen code generation template flie.
31. .vhd - Virtual Hard Disk file / Windows Server Backup virtual disk file.
32. .vic - ViziGen import mappings file.
33. .vip - Magix Audio Clean system project file.
34. .vir - Quarantined virus file.
35. .vls - Visloc script file.
36. .vm - Virtual memory file.
37. .vmc - Microsoft Virtual PC configuration file.
38. .vmf - Ventura font characteristics file / FaxWorks audio file
39. .vmh - Videomach file.
40. .vmm - Virtual Machine (Memory Manager) file.
41. .vob - (DVD) Video Object file.
42. .vpc - ViziGen code generation model control file / VIPP Project Container file.
43. .vs2 - Roland-Bass transfer file.
44. .vsd - Visio drawing file.
45. .vsi - Visual Studio Community Content Installer file.
46. .vsl - GetRight download list file.
47. .vss - Visio stencil.
48. .vsscc - Visual Studio Source Control Solution Root Metadata file.
49. .vssscc - Visual Studio Source Control Solution Metadata file.
50. .vst - Video Template / Truevision Vista graphic / Targa Bitmap
51. .vsw - Visio workspace file.
52. .vxd - Windows 9x virtual device driver. / Windows system driver file allowing a driver direct access to the Windows Kernel, allowing for low level access to hardware.

Computer 'W' file extensions
1. .wab - Windows address book file. / Microsoft Outlook Express personal address book.
2. .wad - File first found in IdSoftware games such as DOOM, Quake, as well as most new games similar to these.
3. .wal - Quake 2 textures.
4. .wav - Waveform audio file./ Sound files in Windows open and played with sound recorder.
5. .wb1 - Quattro Pro Notebook  
6. .wb2 - Quattro Pro Spreadsheet  
7. .wbf - Microsoft Windows Batch File  
8. .wbk - Wordperfect document / workbook 
9. .wbmp - WAP bitmap file. 
10. .wbt - Winbatch batch file  
11. .wcd - Wordperfect macro token list
12. .wcm - Microsoft Works data transmission file / Wordperfect Macro
13. .wcp - Wordperfect product information description
14. .wdb - Windows Works database file.
15. .web - FrontPage web file.
16. .wer - Windows Error Report file.
17. .wfm - dBASE Form object
18. .wfn - CorelDRAW font
19. .wfx - Winfax data file
20. .wg1 - Lotus 1-2-3 worksheet
21. .wg2 - Lotus 1-2-3 for OS/2 worksheet
22. .whb - iPod backup image file.
23. Wid - Ventura publisher width table
24. .win - Microsoft Visual FoxPro save file / Pro/ENGINEER file / Opera saved session file.
25. .wiz - Microsoft Publisher page wizard  
26. .wk1 - Lotus spreadsheet. / Lotus 1-2-3 all versions
27. .wk2 - Lotus spreadsheet.
28. .wk3 - Lotus spreadsheet. / Lotus 1-2-3 for Windows /Lotus 1-2-3 Rel.3.
29. .wk4 - Lotus spreadsheet.
30. .wks - Lotus 1-2-3 Rel lA,2.0,2.01, also file used with Microsoft Works.
31. .wlg - Dr. Watson log file.
32. .wma - Windows Media audio file.
33. .wmf - Graphics file.
34. .wmv - Audio/Video file, these are video files are usually played through the Microsoft Windows Media player or compatible players.
35. .wms - Windows Media Skin definition file.
36. .wmz - Windows Media Skin file.
37. .wor - MapInfo workspace file.
38. .wp - Word Perfect document
39. .wp2 - Winplot file.
40. .wp3 - Windows Photo Story project file / Winplot file.
41. .wp4 - Word Perfect document.
42. .wpd - WordPerfect file. /DOS.
43. .wpg - WordPerfect Graphical files Windows/DOS.
44. .wpm - WordPerfect Macro file.
45. .wpp - Web Plus Project file / WordPerfect colour palette file / Web Part Package file.
46. .wps - Works word processor file. / MS Works word processor Windows/DOS.
47. .wpt - Brother document / Waypoints file / WordPerfect template.
48. .wrf- WebEx Recorded File.
49. .wri - Windows Write Document.
50. .wrk - Lotus 1-2 31.0,1.01,1.1/ Symphony 1,1.01.
51. .wrl - VRML 3D file.
52. .wrz - VRML 3D file.
53. .wsc - Windows script component.
54. .wsdl - Web Services Description Language file.
55. .wsdl.xml - Web Services Description Language file.
56. .wsf - Script host file.
57. .wsh - Script host file.
58. .wsp - Web Site Publisher settings / Paint Shop Pro file / Visual C++ Workspace information file / Word Splash Pro file / Windows SharePoint Services file / Chromeleon workspace file / Whisper 32 password file.
59. .wswksp - Java workspace configuration file.
60. .wsz - Winamp skin.
61. .wtv - Windows (recorded) TV file.
62. .wvf - Waveform data file
63. .wvx - Windows video playlist file.

Computer 'X' file extensions
1. .x - 3d mesh file / RPC language source file.
2. .x3f - Digital camera RAW file format.
3. .xap - Compiled Microsoft Silverlight file.
4. .xar - Vector graphics file / Excel auto-recover save file.
5. .xbm - X windows cursor or bitmap./ X11 Bitmap.
6. .xhtml - XHTML web page
7. .xif - Image file / Pagis scanned document image file.
8. .xlb - Microsoft Excel toolbar file./ Microsoft Excel File.
9. .xlr - Microsoft Works spreadsheet. Microsoft Excel File.
10. .xls - Excel spreadsheet./ Microsoft Excel File.
11. .xlsx - Excel (XML) Spreadsheet file.
12. .xlt - Excel template.
13. .xm - Sound file / Fast tracker 2 extended module.
14. .xml - Generic XML file extension./ Extensible markup language file.
15. .xnk - Exchange shortcut.
16. .xot - Xnetech job output file.
17. .xpf - Homestead SiteBuilder file.
18. .xpi - Cross-Platform Installer Module.
19. .xpm - X picsmap graphic.
20. .xps - Microsoft (XML) Project File.
21. .xqt - SuperCalc macro sheet.
22. .xrf - Cross Reference.
23. .xri - Epic MegaGames Xargon File.
24. .xrp - RationalPlan project file / Gamemaker external resources file.
25. .xsd - XML schema definition file.
26. .xsl - XML Style sheet.
27. .xslt - Extensible Style-sheet Language Transformation file.
28. .xsm - LEXIS-NEXIS tracker.
29. .xtb - LocoScript external translation table.
30. .xtf - eXtended Triton Format file.
31. .xwd - X Windows dump file.
32. .xwf - Yamaha XG Works file.
33. .xxe - Xxencoded file.
34. .xxx - Virtual PC Temporary file.
35. .xy -  XYWrite text file.
36. .xy3 - XYWrite text file.
37. .xy4 - XYwrite IV document.
38. .xyp - XYwrite III plus document.
39. .xyw - XYwrite Windows 4.0 document.

Computer 'Y' file extensions
1. .y - YACC source file. / Amiga YABBA compressed  file archive.
2. .y01/02/03/04/05/06/07/08/09 - Paradox index file.
3. .yuv - Yuv graphics file.
4. .ywf - Yeah Write! word processor file.
5. .yxx - Bison source file.
6. .yz - Compressed archive./ YAC compressed file archive.

Computer 'Z' file extensions
1. .z1 - ZoneAlarm MailSafe quarantined file.
2. .z2 - ZoneAlarm MailSafe quarantined file.
3. .z3 - ZoneAlarm MailSafe quarantined file.
4. .z4 - ZoneAlarm MailSafe quarantined file.
5. .z5 - ZoneAlarm MailSafe quarantined file.
6. .z6 - ZoneAlarm MailSafe quarantined file.
7. .z7 - ZoneAlarm MailSafe quarantined file.
8. .z8 - ZoneAlarm MailSafe quarantined file.
9. .z80 - Sinclair Spectrum emulator file.
10. .z - Unix compressed file./ A compressed file that is extracted and used with various compression utilities. To extract all the files Pkzip or Winzip will need to be used. Unix / Linux users use the compress / uncompress command to extract these files.
11. .zcat - Dell Support Center file.
12. .zhp - Zipped PCL file. / SwiftView command file.
13. .zip - PKzip compressed file or archive / 7-zip compressed file / other compressed file.
14. .zipx - WinZip compressed file.
15. .zix - WixZix compressed file / Quicken data file / Caml Light debugger file.
16. .zmc - ZoneAlarm Mailsafe email file / Passport PC to Host Macro file.
17. .zno - Zinio Reader Magazine file
18. .zoo - Compressed archive./ A compressed file that is extracted and used with various compression utilities.

Computer '#' file extensions
File extensions that start with non-letters. This list of file extensions that do not start with a letter together with a brief description.
1. .$$$ - Temporary file.
2. .$$a - OS/2 program file
3. .$$f - OS/2 database file
4. .$$s - OS/2 spreadsheet file
5. .$d$ - OS/2 planner file
6. .$db - DBASE IV temporary file
7. .$ed - Microsoft C temporary editor file.
8. .$vm - Microsoft Windows temporary file for virtual managers.
9. ._dd - Norton disk doctor recovery file.
10. ._dm - Nuts n Bolts disk minder recovery file.
11. .---  -  File used to backup sys, ini, dat, and other important files from Windows 3.1 and above.
12. .075 - Ventura Publisher 75x75 dpi screen characters
13. .085 - Ventura Publisher 85x85 dpi screen characters
14. .091 - Ventura Publisher 91x91 dpi screen characters
15. .096 - Ventura Publisher 96x96 dpi screen characters
16. .0b - Pagemaker printer font LineDraw enhanced characters.
17. .~ - Outlook express address book backup.
18. .~df - Backup of Delphi form file.
19. .~dfm - Backup of Delphi form file.
20. .~dp - Backup of Delphi project file.
21. .~dpr - Backup of Delphi project file.
22. .~pa - Backup of Delphi source file.
23. .~pas - Backup of Delphi source file.
24. .123 - Lotus 123 spreadsheet file.
25. .12da - 12d Model ASCII exchange format.
26. .1st - Text read-me file./ File used by some software manufacturers to represent a file that should be read first before starting the program.
27. .2gr - Windows 3.x file./ File used in Windows 3.x to display the graphics on older 286 and 386 computers.
28. .256 - Descent 2 palette file.
29. .3dt - 3D Topicscape database file./ Topicscape database for 3D mind map or 3D concept map.
30. .386 - Windows 3.x swap file./ Virtual machine support files for the 386 enhanced  mode.
31. .3g2 - See our 3gp dictionary definition.
32. .3gp - See our 3gp dictionary definition.
33. .3gr - Windows 3.x file./ File used in Windows 3.x to display the graphics on later 386, 486 and Pentium computers.
34. .411 - Sony Mavica data file.
35. .4sw - 4DOS Swap file
36. .4th - Forth language source file.
37. .7z - 7-zip compressed archive file.
38. .906 - Calcomp plotter file.


THE END

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