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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .O3D | Graphic Files | Google Open 3D Web Graphic Format | Google Chrome | ||
| .OBB | Data Files | Android Opaque Binary Blob File | Google Play Console | ||
| .ODT | Oracle Corporation | Text Files | OpenDocument Text Document | Google Drive | |
| .OEB | IDPF (International Digital Publishing Forum) | eBook Files | Open eBook File | Google Play Books | |
| .OGA | Xiph.Org | Audio Files | Ogg Vorbis Audio File | Google Drive | |
| .OGG | Xiph.Org | Audio Files | Ogg Vorbis Audio File | Google Drive | |
| .ORF | Olympus Corporation | Camera Raw Files | Olympus RAW File | Google Picasa | |
| .OS | Open Source | Developer Files | ObjectScript Source File | Google Android |
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