في الحاسب، الثلاثة حروف أو الأربعة الاختيارية التي تنتهي بها أسماء الملفات المستخدمة في أنظمة جدول قيد الملفات FAT (file allocation table) الخاصة بأنظمة DOS and OS/2 والمفصولة عن المقطع الأول من اسم الملف بنقطة، كالآتي: “HIMEM.SYS”. وبعض البرمجيات تضيف تلقائيا امتداد الاسم لتحديد نوع الملفات المستخدمة مع تلك البرمجيات ، مثل Microsoft Word الذي يضيف الامتداد DOC إلى كافة أسماء الملفات ، إلا إذا حدد المستخدم إمتدادا آخر. والقائمة التالية تحتوي على أشهر تلك الامتدادات والبرامج التي تنشئها:
|
Extension |
Creator |
Description |
|
_AD |
Many |
Multimedia audio file |
|
_AU |
Many |
Multimedia audio file |
|
_IM |
Many |
Multimedia image file |
|
!IM |
Many |
Multimedia image file |
|
ARC |
PKARC |
Compressed file |
|
ASC |
Many |
ASCII text file |
|
ASM |
Assemblers |
Assembly language source |
|
BAK |
Many |
Backup file |
|
BAS |
BASIC |
BASIC program may not be
in ASCII |
|
BAT |
Many |
DOS Batchfile |
|
BIN |
Many |
Binary file |
|
CAP |
|
Caption Publisher |
|
CDR |
CorelDraw |
Graphics file |
|
CFG |
Many |
Configuration file |
|
CGM |
Many |
Graphics file |
|
CHK |
CHKDSK |
Recovered file |
|
CHP |
|
Chapter file Publisher |
|
CIF |
|
Chapter information file
Publisher |
|
CMD |
Many |
OS/2 batch file |
|
COM |
DOS |
Executable program |
|
DAT |
Many |
Data file |
|
DB |
Paradox |
Database file |
|
DBF |
dBASE |
Database file |
|
DBT |
dBASE |
Text file |
|
DIB |
Many |
Device independe bitmap |
|
DIF |
Many |
Datai nterchange format
file |
|
DLL |
Many |
Dynamic Link Library |
|
DOC |
Many |
Document |
|
DRV |
Many |
Device driver |
|
DRW |
Micrografx |
Graphics file |
|
DXF |
AutoCAD |
Graphics file |
|
DWG |
AutoCAD |
Drawing file |
|
EPS |
Many |
Encapsulated PostScript
file |
|
EXE |
Many |
Executable program |
|
FLC |
Autodesk |
Animation file Animator |
|
FLI |
Autodesk |
Animation file Animator |
|
FMT |
Many |
Screen format |
|
FNT |
Many |
Font file |
|
FON |
Many |
Font file |
|
FRM |
dBASE |
Report form file |
|
GEM |
Many |
Graphics file |
|
GIF |
Many |
CompuServe graphics file |
|
GRF |
Micrografx |
Graph file |
|
GRP |
Windows |
Group definition file |
|
HLP |
Windows |
Help file |
|
ICO |
Windows |
Icon file |
|
IMG |
Many |
High resolution scanned
image file |
|
INF |
Windows |
Information file |
|
INI |
Windows |
Initialization file |
|
JPG |
Many |
JPEG image file |
|
LBL |
dBASE |
Label description |
|
MDB |
Access |
Database file |
|
ME |
Many |
READ.ME text file |
|
MET |
Many |
Metafile format |
|
MID |
Many |
Standard
|
|
MPG |
Many |
MPEG video file |
|
MSG |
Many |
Message file |
|
NDX |
dBASE |
Index file |
|
OVL |
Many |
Program overlay file |
|
PCX |
Many |
Graphics file |
|
PIC |
Many |
Picture file |
|
PIF |
Windows |
Program formation file |
|
PM |
PageMaker |
age layout file |
|
PM3 |
PageMaker |
Page layout file |
|
PRD |
MSWord |
Printer definition file |
|
PRG |
BASE |
Procedure or Pgram file |
|
PRN |
Many |
File printed to disk |
|
PRS |
WordPerfect |
Printerfile |
|
PS |
PostScript |
Page description file |
|
RLE |
Windows |
Run length encoded
compressed bitmap file |
|
RTF |
Many |
Rich text format file |
|
SCR |
dBASE |
Screen layout file |
|
SLD |
AutoCAD |
Slide format file |
|
STY |
Many |
Style sheet file |
|
SYS |
DOS and OS/2 |
System file |
|
TGA |
Many |
Image file format |
|
TIF |
Many |
Tagimage file format |
|
TMP |
Many |
Temporaryfile |
|
TTF |
TrueType |
Font file |
|
TXT |
Many |
Text file |
|
VGR |
|
Chapter file Publisher |
|
VID |
Many |
Multimedia image file |
|
VOC |
Many |
Soundfile |
|
WE |
dBASE |
Relationalview |
|
WAV |
Many |
Sound file |
|
WK1 |
Lotus 123 |
Spreadsheet |
|
WKS |
Lotus 123 |
Spreadsheet & MS Works |
|
WMF |
Many |
Windows metafile |
|
WPS |
MS Works |
Word processor file |
|
WRI |
Windows |
Windows Writefile |
|
XLC |
Excel |
Chart |
|
XLS |
Excel |
Spreadsheet |
|
ZIP |
PKZIP |
Compressed file |
|
$$$ |
Many |
Temporary file |