[A][B][C][D][E][F][G][H][I][J][K][L][M][N][O][P][Q][R][S][T][U][V][W][XYZ]

X
X
AVS image format
XAR
Corel Xara drawing
XBM
A MIME 'xbitmap' image
XI
Instrument sample file for ScreamTracker
XIF
Wang imaging file (comes with Windows 95)
XLA
Microsoft Excel add-in
XLB
Microsoft Excel toolbar
XLC
Microsoft Excel chart
XLD
Microsoft Excel dialogue
XLK
Microsoft Excel backup
XLL
Microsoft Excel add-in file
XLM
Microsoft Excel macro
XLS
Microsoft Excel worksheet
XLT
Microsoft Excel template
XLV
Microsoft Excel VBA module
XLW
Microsoft Excel workbook / workspace
XM
FastTracker 2, Digital Tracker music module (MOD) file
XNK
Microsoft Exchange shortcut file
XPM
X BitMap format
XR1
Epic MegaGames Xargon data file
XTP
XTree data file
XWD
X Window Dump format
XWF
Yamaha XG Works file (MIDI sequencing)
XY3
XYWrite III document
XY4
XYWrite IV document
XYP
XYWrite III Plus document
XYW
XYWrite for Windows 4.0 document
X16
Macromedia Extra (program extension), 16 bit
X32
Macromedia Extra (program extension), 32 bit

Y
YAL
Arts & Letters clipart library
YBK
Microsoft Encarta Yearbook

Z
Z
Unix Gzip
Compressed
ZIP
Zip file
Compressed archive
ZOO
An early compressed file format

Numbers and symbols
000-999
Used to number old (backup) versions of files (for example, CONFIG.SYS when
changed by an installation program); also used to number related data files
for multiple users of a small- scale PC application
12M
Lotus 123 97 Smartmaster file
123
Lotus 123 97 file
2GR and 3GR
VGA Graphics driver/configuration files under Windows
3DM
3D NURBS modeler, Rhino
3DS
A file in 3D Studio (for DOS) format
386
A file for use in an 80386 or higher microprocessor
4GE
Informix 4GL compiled code
4GL
Informix 4GL source code
669
Composer 669, Unis Composer music mod file
669
669 tracker module
#01 and higher
A method of numbering picture files for a roll of film that has been
scanned for computer presentation
$$$
Used by OS/2 to keep track of archived files
@@@
Screen files used in the installation and instruction on use of such
applications as Microsoft Codeview for C

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