List of filename extensions

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This alphabetical list of filename extensions contains standard extensions associated with computer files.


Ext. Description Used by
### Temporary file Program-dependent format
#24 Printer data file for 24-pin matrix printer LocoScript
#IB Printer data file LocoScript
#nn Part of file image Long
#SC Printer data file LocoScript
#ST Standard mode printer definitions LocoScript
$$$ OS/2 archive file (i.e. archives$.$$, keys$.$$) OS/2
$$$ Temporary file
$? ZX Spectrum file in HOBETA format
$00 Pipe file DOS
$DB Temporary file dBASE IV
$ED Editor temporary file MS C
$O1 Pipe file DOS
$VM Virtual manager temporary file Windows 3.x
&01, &02, etc Holdfast backup archive files Holdfast
)2( LHA archiver temporary file LHA
??$ Backup file P-CAD
??_ Microsoft packed file Expand
?DK Disk image Loaddskf.exe
?UT Nonpacked FTN mail (? - flavor) FidoNet
!qB Unfinished qBittorrent download qBittorrent
!ut Unfinished µTorrent download µTorrent
___ Adinf table Adinf
EX_ Compressed executable file Note: EX could be any first two characters in a file extension (e.g. BM_ for compressed bitmap (BMP), DL_ for compressed library, etc.) Files compressed using this method have been in use on Microsoft software CDs and floppies since around 1995.
?Q? Squeeze CP/M and MS-DOS
~$~ Temporary file 1st Reader
~1~, ~2~, etc. Backup file (name is constructed with numbered backup option by appending ~, the incremented number, and another ~ after the original name) GNU coreutils (cp, install, ln, mv ), Emacs
~?? Old Backup files (.MNU to .~MN) Resource Workshop (Borland Delphi)
~H Cardfile heap AZZ Cardfile
μ Metrowerks Codewarrior project
Π THINK C project


Ext. Description Used by
0 Compressed harddisk data DoubleSpace
0B Printer font with lineDraw extended character set PageMaker
001, 002, ... Split parts of a single whole file FFSJ, HJSplit, JJSplit, split (Unix) (when using numeric suffixes)
1 Fax (Many programs)
1 Roff/nroff/troff/groff source for manual page
123 Spreadsheet Lotus 1-2-3 version 9 and version 97
123dx CAD drawing file Autodesk 123D design file, a ZIP file format package containing a .sat file and .png thumbnails.[1]
15U Printer font with PI font set PageMaker
16 SYSLINUX Splash Screen Graphic SYSLINUX, XnView
1ST Usually README.1ST text file
1TX 1toX Logipole file
2GR 286 Grabber File Win
301 Fax Super FAX 2000 - Fax-Mail 96
386 Intel 80386 processor driver Windows 3.x
386 Windows virtual device driver Win
3D Universal Combat 3D model file Universal Combat
3DMF QuickDraw 3D Metafile QuickDraw
3DS 3D Studio Graphics format 3D Studio
3DSX Nintendo 3DS Homebrew File Format Nintendo 3DS Homebrew Launcher
3DT Database in which the meta-data of a 3D Topicscape is held 3D Topicscape
3DV 3-D wireframe graphics by Oscar Garcia 3dv wireframe viewer
3FX Effect CorelChart
3GA Mobile Phone Audio (Samsung)
3GP Mobile Phone Video
3GR 386 Grabber File Win
3T4 Binary file converter to ASCII Util3
4DB 4D Structure File 4D
4DD 4D Data File 4D
4DIndy 4D Structure Index File 4D
4C$ Datafile 4Cast/2
4MD Musical file
4SW 4DOS Swap File 4DOS
4TH FORTH source code file ForthCMP - LMI Forth
555 16 bit per pixel image file format (5bit per component) Sierra Entertainment
602 Text (fairly simple format, plain text with binary control commands embedded within text lines and special formatting commands on dedicated lines) Text602 text processor by Software602
668 Music (the mixing is always at 12048 Hz)
669 Music (8 channels) The 669 Composer
6CM Music (6 Channel Module) Triton FastTracker
75 75×75 dpi display font Ventura Publisher
7z A compressed archive file format that supports several different data compression, encryption and pre-processing algorithms 7-Zip
8 A86 assembler source code file
85 85×85 dpi display font Ventura Publisher
8BF Adobe Photoshop compatibile filters/plugins
890 ScanTitling subtitle files
8CM Music (8 Channel Module) Triton FastTracker
8M Printer font with Math 8 extended character set PageMaker
8U Printer font with Roman 8 extended character set PageMaker
83p Executable program for TI-83 Graphing Calculator TI Connect
89p Executable program for TI-89/89 Titanium Graphing Calculator TI Connect
8xp Executable program for TI-83/84 Plus Graphing Calculator TI Connect
91 91×91 dpi display font Ventura Publisher
96 96×96 dpi display font Ventura Publisher





See also[edit]