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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 - O

These are all file name extensions starting with letter O.


  • .o   - Object file
  • .obj - Object file (Windows
  • .oca - VB cache file
  • .ocx - ActiveX control
  • .ogg - Ogg Vorbis music file
  • .old - Generic old or backup file
  • .opf - FlipBook definition fil
  • .opt - Visual studio workspace information file
  • .ost - Exchange offline storage file


Generated 12:02:04 on May 26, 2018