.O files

• .a
• .b
• .c
• .d
• .e
• .f
• .g
• .h
• .i
• .j
• .k
• .l
• .m
• .n
• .o
• .p
• .q
• .r
• .s
• .t
• .u
• .v
• .w
• .x
• .y
• .z
• .other

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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