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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .OCR | URUWORKS | Uncommon Files | Subtitle Workshop OCR Script | Apple TextEdit | Apple |
| .OCTEST | Apple | Developer Files | Xcode Objective-C Unit Test Bundle | Apple Xcode | Apple |
| .ODC | Microsoft Corporation | Settings Files | Office Data Connection File | Apple Safari | Apple |
| .ODT | Oracle Corporation | Text Files | OpenDocument Text Document | Apple TextEdit | Apple |
| .OEB | IDPF (International Digital Publishing Forum) | eBook Files | Open eBook File | Apple Pages | Apple |
| .OGX | Xiph.Org | Video Files | Ogg Vorbis Multiplexed Media File | Apple QuickTime Player | Apple |
| .OMF | Avid Technology | Audio Files | Open Media Framework File | Apple Final Cut Pro | Apple |
| .ONLINE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .OR | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .ORF | Olympus Corporation | Camera Raw Files | Olympus RAW File | Apple Photos | Apple |
| .OSMALLER | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .OSX | Apple | Executable Files | PowerPC Executable File | macOS | Apple |
| .OUT | Open Source | Executable Files | Compiled Executable File | Apple TextEdit | Apple |
| .OVW | Apple | Audio Files | Logic Pro Overview File | Logic Pro X | Apple |
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