.O files
This page contains a list of file extensions that start with .O. The page contains summary information only, for further information about a file extension click on the file extension from the list below. If you require information about a file extension starting with a different letter then follow one of the links above.
- .o - Object file.
- .obj - Object file (Windows).
- .obl - InstallScript library file.
- .oca - VB cache file.
- .ocx - ActiveX control.
- .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.
- .osp - OpenShot Video Editor project file.
- .ovl - Driveimage setup file / Overlay file.
- .ovpn - OpenVPN configuration file.
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