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    File Extension

    A (typically) three-character addition to a computer file name. With some computer platforms (in particular, DOS), the name of a file is limited to eight characters, followed by a period and a three-character extension (such as "FILENAME.EXT"). The extension is often used to indicate the file format in which the file was saved. Some common extensions used for graphics files include ".eps" (encapsulated PostScript), ".pct" (PICT), ".tif" (TIFF), etc. File extensions are useful means of indicating and determining file type. Also known as a file-name extension.

    Many common file extensions used in DOS, Windows, and OS/2 include:

    AIAdobe Illustrator

    AIFAudio Interchange File Format

    BAKBackup copy of an edited file

    BMPBitmap graphic

    CDRCorel Draw vector graphics

    CMDOS/2 command file

    COMDOS command file

    DOCASCII text document

    DLLDynamic link library

    EPSEncapsulated PostScript file

    EXEExecutable file, or machine language file

    GIFGraphics Interchange Format file

    HLPHelp file


    INIInitialization file

    JPGJPEG file

    MIDMIDI file

    PCTPICT file

    PCXZsoft bitmap file

    PDFPortable Document Format file

    PIFProgram Information File

    PSPostScript file

    SEAStuffIt self-expanding archive

    SITStuffIt (compressed) archive)

    SYSOperating system component

    TEXTEX or LATEX document

    TGATARGA graphics file

    TIFTIFF graphics file

    TMPTemporary file

    TXTASCII text file

    WAVSound wave file

    WKQQuattro spreadsheet file

    WMFWindows MetaFile

    WKSLotus 1-2-3 worksheet file

    XLSMicrosoft Excel worksheet file

    ZIPPKZIP-compressed file

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