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- EXTENSION WHAT IT (USUALLY) MEANS
- @nn File created by the BACKUP command
- xx@ Compressed file on an OS/2 installation diskette
- AIx MS-Windows Application Interface Driver
- APP SQL Windows Application File
- ARC Archive file output by some archive program
- ASM Assembler input for MACRO Assembler
- BAK Editor program backup copy of text file
- BAS BASIC language source program
- BAT A batch file for DOS
- (The BATCH_COMMANDS topic talks about batch files.)
- BGI Borland Graphics Interface file
- BI SQL Database Before Image File
- BIN Binary image version of an executable object file
- BMP MS-Windows BitMaP files, ICONEDIT format
- C C language source program
- CAL A spreadsheet file in SuperCALC format
- CBL COBOL language source program
- CCL inTalk - CCL script files
- CFG A configuration file for some program
- CGM A graphics file in Computer Graphics Metafile format
- CMD A batch file for OS/2
- CNF A configuration file for some program
- COB COBOL language source program
- COM A program in COMmand image format (small and fast)
- CP2 A file containing data normally used only by CopyII PC
- CPI A file containing Code Page Information
- CSV A text file in comma separated variable format
- CUR MS-Windows CURsor files, ICONEDIT format
- DAT A data file
- DBF A database file in dBASE format
- DBS SQL Database File
- DCP A Display Code Page file for OS/2
- DCT Hyphenation dictionary file or a word processor
- DIF A spreadsheet file in Data Interchange Format
- DLL A Dynamic Link Library for OS/2
- DOC A file containing documentation for some program
- DRV A program used to control (drive) a peripheral device
- DRW A graphics file for MS-Windows Draw
- DXB A file for computer aided drawing programs (also DXF)
- EPS A graphics file in Encapsulated PostScript format
- EXE A program in EXEcutable load module format (large)
- FNT MS-Windows font files, FONTEDIT format
- FON MS-Windows font files, GDI loadable format
- FOR FORTRAN language source program
- GEM A graphics file for Graphics Environment Manager (GEM)
- H C language include file
- HLP A help file for some program
- ICO MS-Windows ICOn files, ICONEDIT format
- IMG Datacopy high-resolution scanned image
- INC PASCAL language include file
- INI Initialization files (e.g., WIN.INI)
- LIB Linker library file
- LST Source output listing from some compiler
- MAC Macro input file
- MAK A make file for some program
- MAP Linker listing file
- MEU A file containing menu displays
- MOS A mouse driver program
- (The CONFIG.SYS DEVICE topic talks about drivers.)
- MSP MS-Windows Paint files
- NDX An index file in dBASE format
- OBJ Object code output by some complier
- OVR File overlay to be used with a EXE or COM file
- PAS PASCAL language source program
- PAK Archive file output by some archive program
- PCO A PC-Outline file
- PCX Z-Soft's PC Paintbrush files (also .PCC)
- PFM MS-Windows Printer Font Metric files
- PIC A graphics file for LOTUS-1-2-3, old MS-Windows Draw
- PIF MS-Windows Program Information File
- PRG A program for dBASE III PLUS
- PRN A text file formatted for the printer
- PUB PageMaker PUBlication files
- RBS A database file in R:base format
- RXF A database file in Reflex format
- SLK A spreadsheet file in SYLK format
- SYL A spreadsheet file in SYLK format
- SYS A system file, probably in binary image format
- (The CONFIG.SYS DEVICE topic talks about .SYS files)
- TIF A graphics file in Tagged Image File format
- TMP A temporary file
- TXT A text file
- WK1 A spreadsheet file in LOTUS-1-2-3 format (also WKS)
- WMF PageMaker-compatible MS-Windows Metafiles
- WRI MS-Windows Write Document File
- XLC A spreadsheet file in Excel format (also XLM, XLS, XLW)