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The most important file types used in Windows, Mac OS and Linux/ Unix, grouped by their extension's first letter.

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File types by extension - B

These are all file name extensions starting with letter B.


  • .bak - Generic backup file
  • .bas - BASIC source code file
  • .bat - MS-DOS batch file
  • .bbc - BBC BASIC for Windows program or data file
  • .bck - VMS backup file
  • .bil - Spot raster image file
  • .bin - Generic binary file / MacBinary encoded file
  • .bk - Adobe FrameMaker book file
  • .bkf - Windows backup file
  • .bkp - backup fil
  • .bks - Backup selection file
  • .blk - Descent Mission Builder block file
  • .bmp - Bit-map image file
  • .bnk - Decent 2 FM sound instrument definition file
  • .bpg - Borland Delphi project group file
  • .bpl - Borland package library
  • .brn - BrainStorm model file
  • .bsc - Browse information file
  • .btm - Batch to memory file
  • .bud - Backup disk for Quicken
  • .bz2 - Bzip2 compressed file


Generated 20:02:15 on Jun 26, 2017