| List of file extensions begins with O |
You can choose one of the following extensions which begin with the letter 'O':
| Extension | Popularity |
|---|---|
| .o | Low |
| .o2s | Low |
| .oas | Low |
| .obd | Very High |
| .obi | Low |
| .obj | Very High |
| .obm | Low |
| .obr | Low |
| .obs | Low |
| .obskin | Low |
| .obt | Very High |
| .obz | Very High |
| .oca | Medium |
| .ocr | Low |
| .ocrec | Low |
| .ocsmeet | Low |
| .ocx | Very High |
| .odb | Very High |
| .odc | Very High |
| .odccubefile | Very High |
| .odcdatabasefile | Very High |
| .odcnewfile | Very High |
| .odctablecollectionfile | Low |
| .odctablefile | Very High |
| .odf | High |
| .odg | High |
| .odh | Very High |
| .odl | Very High |
| .odm | High |
| .odp | Very High |
| .ods | Very High |
| .odt | Very High |
| .oeaccount | Low |
| .oem | Low |
| .oemigaccount | Low |
| .oetpl | Low |
| .oex | High |
| .ofc | Low |
| .ofl | Low |
| .ofn | Low |
| .ofr | Very High |
| .ofs | Very High |
| .oft | Very High |
| .ofx | Low |
| .oga | Very High |
| .ogg | Very High |
| .ogm | Very High |
| .ogv | Very High |
| .ogx | Very High |
| .oil | Low |
| .okt | Very High |
| .olb | Low |
| .old | Low |
| .olproj | Low |
| .ols | Very High |
| .oma | Very High |
| .omf | Low |
| .omg | Low |
| .omod | Low |
| .omu | Low |
| .on2 | Low |
| .one | Very High |
| .onepkg | Very High |
| .onetoc | Very High |
| .onetoc2 | Very High |
| .oodagtdat | Low |
| .oodagtid | Low |
| .oodagtrpd | Low |
| .oodbri | Low |
| .oodbrp | Low |
| .oodguisettings | Low |
| .opc | Very High |
| .opcses | Low |
| .opd | Low |
| .opf | Low |
| .oph | Low |
| .opj | Low |
| .opk | Low |
| .opl | Low |
| .opml | Low |
| .oprc | Low |
| .opt | Low |
| .opus | Low |
| .opx | Low |
| .oqy | Very High |
| .or6 | Low |
| .ora | Low |
| .orderedtest | High |
| .orf | Very High |
| .osdx | Very High |
| .osf | Low |
| .osl | Low |
| .oss | High |
| .ost | Very High |
| .otb | Low |
| .otf | Very High |
| .otg | High |
| .oth | Very High |
| .otherfolder | Low |
| .otl | Low |
| .otm | Very High |
| .otn | Low |
| .otp | High |
| .ots | Very High |
| .ott | Very High |
| .otv5key | Low |
| .out | Low |
| .out1 | Low |
| .ova | Very High |
| .ovf | Very High |
| .ovisuite | Low |
| .ovl | Low |
| .ovpn | Low |
| .owl | Low |
| .oxps | Medium |
| .oxt | Very High |
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