Windows
Support Guide

Applies to: Microsoft Windows (All versions)
Home Find file extension (eg.: .doc,.png)

File extension?

A file extension is a suffix to the name of a computer file, which defines and determines easily the file's generic type. In Windows and DOS operating system file extension is a requirement whereas, in some other operating system such as UNIX it is optional. Usually the file extension consists of two, three or four characters following a period.
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Recently updated file extensions

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Find file extension (eg.: .pdf)

.o - Source code and script files

.o01 - Audio file type

.o2c - Miscellaneous file type

.OAA - Miscellaneous file type

.oad - Miscellaneous file type

.oax - Miscellaneous file type

.oaz - Graphic file type

.ob - Backup file type

.ob! - Miscellaneous file type

.obd - Text file type

.obj - Graphic file type

.objf - Data file type

.obk - Miscellaneous file type

.obm - Miscellaneous file type

.obp - Miscellaneous file type

.obr - Miscellaneous file type

.obs - Executable file type

.obt - Document file type

.obv - Source code and script files

.obz - Miscellaneous file type

.oc_ - Game file type

.oca - Miscellaneous file type

.ocf - Text file type

.oci - Miscellaneous file type

.ocp - Miscellaneous file type

.oct - Miscellaneous file type

.ocx - System file type

.odb - Database file type

.odc - Text file type

.odccubefile - Miscellaneous file type

.odcdatabasefile - Miscellaneous file type

.odcnewfile - Miscellaneous file type

.odctablefile - Miscellaneous file type

.odf - Text file type

.odg - Graphic file type

.odh - Source code and script files

.odif - Text file type

.odinprj - Miscellaneous file type

.odl - Source code and script files

.odm - Text file type

.odp - Text file type

.ods - Text file type

.odt - Text file type

.odz - Miscellaneous file type

.oe3 - Miscellaneous file type

.oe4 - Miscellaneous file type

.oeb2 - Miscellaneous file type

.oem - Miscellaneous file type

.oes - Miscellaneous file type

.oetpl - Miscellaneous file type

.ofa - Miscellaneous file type

.ofc - Data file type

.ofd - Miscellaneous file type

.off - Image file type

.ofl - Miscellaneous file type

.ofm - Font file type

.ofn - Miscellaneous file type

.ofr - Miscellaneous file type

.ofs - Miscellaneous file type

.oft - Data file type

.ofx - Graphic file type

.oga - Audio file type

.ogg - Audio file type

.ogm - Video file type

.ogv - Video file type

.ogx - Miscellaneous file type

.ohb - Source code and script files

.ohs - Video file type

.oif - Miscellaneous file type

.oil - Miscellaneous file type

.okt - Audio file type

.olb - Miscellaneous file type

.old - Backup file type

.oli - Text file type

.olproj - Miscellaneous file type

.ols - Miscellaneous file type

.olt - Miscellaneous file type

.oma - Audio file type

.omf - Miscellaneous file type

.omg - Audio file type

.oml - Miscellaneous file type

.omp - Miscellaneous file type

.omt - Miscellaneous file type

.on2 - Miscellaneous file type

.one - Text file type

.onepkg - Backup file type

.onetoc - Miscellaneous file type

.onetoc2 - Miscellaneous file type

.onx - Graphic file type

.oof - Game file type

.oog - Graphic file type

.oom - Miscellaneous file type

.ooo - Miscellaneous file type

.opc - Miscellaneous file type

.opd - Text file type

.opf - Miscellaneous file type

.opj - 3D graphics file type

.opl - Miscellaneous file type

.opml - Text file type

.opn - Miscellaneous file type

.oprc - Miscellaneous file type

.ops - Miscellaneous file type

.opt - Configuration file type

.opw - Database file type

.opx - Miscellaneous file type

.opxt - Miscellaneous file type

.opz - Miscellaneous file type

.oqy - Miscellaneous file type

.or6 - Miscellaneous file type

.ora - Configuration file type

.orderedtest - Miscellaneous file type

.orf - Graphic file type

.orf valuetype: stri...dll - Miscellaneous file type

.org - Data file type

.org- - Miscellaneous file type

.ori - Backup file type

.orig - Backup file type

.osdx - System file type

.osh - Miscellaneous file type

.osl - Miscellaneous file type

.osp - Miscellaneous file type

.oss - Miscellaneous file type

.ost - Text file type

.osx - Miscellaneous file type

.ota - Miscellaneous file type

.otb - Miscellaneous file type

.otf - Miscellaneous file type

.otg - Text file type

.oth - Internet related file type

.OtherFolder - Miscellaneous file type

.otl - Data file type

.otm - Miscellaneous file type

.otn - Miscellaneous file type

.otp - Text file type

.otr - Miscellaneous file type

.ots - Audio file type

.ott - Text file type

.otv - Miscellaneous file type

.otv4key - Miscellaneous file type

.otx - Miscellaneous file type

.out - Data file type

.ov1 - Miscellaneous file type

.ov2 - Configuration file type

.ova - Data file type

.ovd - Miscellaneous file type

.ovf - Data file type

.ovl - Game file type

.ovpn - Miscellaneous file type

.ovr - Data file type

.ovx - Miscellaneous file type

.owl - Miscellaneous file type

.ows - Miscellaneous file type

.oxt - Text file type

.oxygene - Miscellaneous file type

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