Apple II File types

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.2MG also .2IMG- XGS IIgs disk image file usually 800k or larger (GS ASIMOV2; PC Imgutnew.exe)
.AAF Apple Archive Format [TEXT] for source code (aaf.unpacker)
.ACU NuFX Applelink archive (ShrinkIt*)
.ALU usually a multi-file, non-compressed A2 archive (ALU)
.APF GS super-res “Apple Preferred” packed graphics format (Platinum Paint, Convert 3200, etc.)
.ARC PC Archive (GS-ShrinkIt* or DeArc2E or PC Arc program)
.BMP Windows Bit-Mapped graphics format (GS Convert 3200; many PC viewers)
.BNX NuFX with BLU header. (ShrinkIt*)
.BNY BLU archive. (ShrinkIt*)
.BQY NuFX with BLU header. (ShrinkIt*)
.BSC BinScii file. [TEXT]  (BinScii or GScii)
.BSE A GSHK* .SEA file with a Binary II header (ShrinkIt*)
.BSQ BinScii\’d NuFX file. [TEXT]  (BinScii plus ShrinkIt* on the result)
.BXY NuFX archive with a Binary II header. (ShrinkIt*)
.CPT Compactor Pro archive (Compactor Pro on a Mac only)
.DIMG Diskcopy disk image file usually produced by a Mac (GS Clone or Diskcopy; Mac Diskcopy; PC Imgutnew.exe)
.DO a .DSK file specified as having data in “DOS 3.3 Order” i.e. uses DOS 3.3 sector ordering (A2 DSK2FILE and GS ASIMOV)
.DSK standard emulator disk image– length is 143360 bytes for 5.25″ disk images (A2 DSK2FILE and GS ASIMOV)
.EXE A2 Executioner file [TEXT]. (On A2; some files may EXEC properly under only DOS 3.3.)
.GIF Graphics Interchange Format: Compressed picture (IIGIF for //e; Super Convert, … on GS; PC, etc.: many viewers and editors)
.GZ GZip PC archive format often used for storing A2 emulator disk images (GS GZPK v2 plus PMPUnZIP or Angel; PC WinZIP)
.HDV Raw (DSK) ProDOS ordered disk image file 800K or greater in size; used by emus as a virtual hard disk (ASIMOV2 on IIgs)
.HQX Mac BinHex file. [TEXT] (BinHex on Mac or GScii)
.HTM HTML [TEXT] with embedded Text commands (Web browsers, web editors, etc.)
.IMAGE DiskCopy images (see .DIMG)
.IMG Type IMG or “user #7” Copy II Plus disk image file (A2 Copy II Plus v6.x or v7.x) .IMG is sometimes used for Diskcopy images (see .DIMG)
.JPG PC JPEG hi-res, hi-color graphics format (GS JPEG.VIEWER, etc. B/W only or PC, Unix viewers)
.LBR a multi-file, non-compressed A2 archive (Librarian)
.LHA LHA Archive (PC/Amiga LZH program)
.LZH LZH Archive (PC/Amiga LZH program)
.NIB emulator disk image (typical length: 232960) for protected 5.25″ software (A2 Saltine\’s Super Transcopy)
.PCX PC graphics format (GS Convert 3200; PC many viewers)
.PD compressed GS multi-palette graphics file w/o palettes (GS SuperPac)
.PNG PC PING hi-res, hi-color graphics format (PC viewer)
.PO a .DSK file specified as having data in “ProDOS Order” i.e. uses ProDOS sector ordering (A2 DSK2FILE and GS ASIMOV)
.PS compressed GS multi-palette graphics file with palettes (GS SuperPac)
.QQ BLU archive.  (ShrinkIt*)
.SDK ShrinkIt disk image, usually NuFX-compressed (ShrinkIt*)
.SEA Self-extracting A2 ShrinkIt* or Mac ShrinkIt archive (depending upon kind, run on Apple IIgs or Mac)
.SHK usually an A2 NuFX-compressed archive; non-A2-compatible Mac .SHK archives also exist (GS ShrinkIt* / Mac unshrinker utility / PC Nulib– does not extract GS resource forks)
.SIT Mac StuffIt archive. (Stuffit on Mac or GS ShrinkIt) GS-ShrinkIt will not decode StuffIt Deluxe files.
.TAR Unix Tape Archive (Unix tar with -xvf option, GS EXE tar)
.TGZ Gzipped .TAR file
.TIFF Graphics format (GS SHR Convert)
.TXT [TEXT] An ASCII text file (Text editors, word processors, etc.)
.UU Unix uuencode file [TEXT] (A2 uudecode or Unix uudecode)
.UUE Unix uuencode file [TEXT] (A2 uudecode or Unix uudecode)
.Z Compressed file (GS-ShrinkIt or Unix uncompress)
.ZIP PC Zip Archive (GS PMPUnZIP or UNZIP [GS Shell EXE] or PC WinZIP, PKUNZIP, Unix unzip)
.ZOO PC Zoo Archive (GS-ShrinkIt??? or PC ZOO program)

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