FILE EXTENSIONS, KNOWN FILE EXTENSIONS, LATEST FILE EXTENSIONS,

KNOWN FILE TYPE, WINDOWS FILE EXTENSIONS, COMPUTER FILE EXTENSIONS, COMPUTING FILE EXTENSIONS, PROGRAM FILE EXTENSIONS, FILE SUFFIX, FILE PREFIX, FILE CAST, FILE CASTING, FILE IDENTIFICATION, WINDOWS-LINUX-OS2-UNIX-NT- FILE EXTENSIONS, HOW TO IDENTIFY A FILE (IN A COMPUTER), NATURE OF COMPUTER FILES, NATURE OF FILE FORMAT, COMPUTING FILE CLASSIFICATION, FILE CLASSIFICATION IN WINDOWS, FILE CLASSIFICATION IN LINUX, FILE EXTENSIONS IN LINUX, FILE EXTENSIONS IN WINDOWS, FILE EXTENSIONS IN IT, FILE CLASSIFICATION IN EXTENSIONS, WINDOWS FILE TYPE, KNOWN WINDOWS FILE TYPES, KNOWN LINUX FILE TYPES; FILE CLASSIFICATIOIN ACCORDING TO COMPUTING; FILE CLASSIFICATION IN COMPUTING, SOFTWARE FILE EXTENSIONS, WHAT IS FILE EXTENSION, WHAT IS FILE TYPE IN WINDOWS; WHAT IS A FILE; WHAT IS A FILE CAST; HOW MANY FILES ARE THERE IN A COMPUTER, HOW MANY FILE TYPE ARE THERE IN A COMPUTER; HOW TO IDENTIFY A FILE IN A COMPUTER, DOS FILE TYPE; DOS FILE EXTENSIONS; HOW MANY FILES ARE THERE IN A OPERATING SYSTEM; HOW MANY FILES ARE THERE IN A COMPUTER AND WINDOWS; CLASSIFICATION OF WINDOWS FILE; CLASSIFICATION OF LINUX FILES; HOW MANY FILES ARE THERE IN THE WORLD; HOW TO IDENTIFY A FILE IN WINDOWS; HOT TO IDENTIFY A FILE IN LINUX; HOW TO IDENTIFY A SOFTWARE FILE; SOFTWARE FILE CLASSIFICATION - AND KNOWN FILE TYPE; FILE GROUP; WINDOWS FILE GROUPING; GROUP OF FILES; WINDOWS FILING SYSTEM; EXTENSION REGISTRATION; KNOWN FILE EXTENSIONS TILL DATE;

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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
$0	Pipe file	DOS
$DB	Temporary file	dBASE IV
$ED	Editor temporary file	MS C
$O1	Pipe file	DOS
$VM	Virtual manager temporary file	Windows 3.x
)2(	LHA archiver temporary file	LHA
??$	Backup file	P-CAD
??_	Microsoft packed file	Expand
?DK	Disk image	Loaddskf.exe
?UT	Nonpacked FTN mail (? - flavor)	FTN software
!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 for CP/M and MS-DOS
~$~	Temporary file	1st Reader
~??	Old Backup files (.MNU to .~MN)	Resource Workshop - Borland Delphi
~H	Cardfile heap	AZZ Cardfile
μ	Metrowerks Codewarrior project
Π	THINK C project
@@1, @@2, etc.	Hidownload temporary file	Hidownload
#
Ext.	Description	Used by
0	Compressed Hard Disk Data	DoubleSpace
0B	Printer font with lineDraw extended character set	PageMaker
1337	Kiwi's RTCoD File Format	Se7ensins & Teh1337
001, 002, ...	Split parts of a single whole file	HJSplit, JJSplit, split (Unix) (when using numeric suffixes)
1	Fax
1	Fax	many
1	Roff/nroff/troff/groff source for manual page	cawf2.zip
123	Spreadsheet	Lotus 1-2-3 version 9 - Lotus 1-2-3 version 97
15U	Printer font with PI font set	PageMaker
1ST	Usually README.1ST text file
2GR	286 Grabber File	Win
301	Fax	Super FAX 2000 - Fax-Mail 96
386	Intel 80386 processor driver	Windows 3.x
386	Windows virtual device driver	Win
3DMF	QuickDraw 3D Metafile	QuickDraw
3DS	3D Studio Graphics format	3D Studio
3DT	Database in which the meta-data of a 3D Topicscape is held	3D Topicscape
3DV	3-D wireframe graphics by Oscar Garcia	3dv wireframe viewer
3FX	Effect	CorelChart
3GR	386 Grabber File	Win
3GP	Mobile Phone Video
3T4	Binary file converter to ASCII	Util3
4C$	Data file	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
668	Music (the mixing is always at 12048 Hz)
669	Music (8 channels)	The 669 Composer
6CM	Music (6 Channel Module)	Triton FastTracker
75	75x75 dpi display font	Ventura Publisher
7z	7-Zipped file
8	A86 assembler source code file
85	85x85 dpi display font	Ventura Publisher
8BF	Adobe Photoshop compatibile filters/plugins
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 Plus 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	91x91 dpi display font	Ventura Publisher
96	96x96 dpi display font	Ventura Publisher