This page provides a list of those file extensions that start with .o. The information given below is a summary and further details can be found by clocking on the summary next to the file extension of interest.
|.obj||Object file (Windows).|
|.obl||InstallScript library file.|
|.oca||VB cache file.|
|.od||Mascopt graph request file.|
|.odc||Microsoft Office Data Connection file.|
|.ods||OpenOffice spreadsheet | Outlook Express mailbox.|
|.odt||OpenDocument Text document | Virtual Reality Explorer Kit Object file.|
|.oeb||Open eBook file.|
|.oft||Outlook form template file.|
|.ogg||Ogg Vorbis music file.|
|.old||Generic old or backup file.|
|.one||Microsoft OneNote file.|
|.opf||FlipBook definition file.|
|.ops||Microsoft Outlook Profile Settings file.|
|.opt||Visual studio workspace information file.|
|.orf||Olympus Raw File | Descent 3 Outrage Room Format file | Override Rules File.|
|.ost||Exchange offline storage file.|
|.ovl||Driveimage setup file | Overlay file.|
For further information about the file extension please do click on the summary next to the file extension in the list above.
We would like this listing to be complete and comprehensive, but recognised that we may have missed one and that new file types are being used all the time. So if you know of a file type that we have missed that should be listed here then please let us know.