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| Estensione | Sviluppatore del Tipo di File | Categoria File | Descrizione del Tipo di File | Software Principale | Sviluppatore del Software Primario |
|---|---|---|---|---|---|
| .OAS | Fujitsu Limited | File vari | Fujitsu OAS Document File | OASYS Viewer | Fujitsu Limited |
| .OB | Innoshock | File vari | Orbit Downloader Incomplete Download | Orbit Downloader | Innoshock |
| .OB! | Innoshock | File vari | Orbit Downloader Incomplete Download | Orbit Downloader | Innoshock |
| .OCR | URUWORKS | File vari | Subtitle Workshop OCR Script | URUWorks Subtitle Workshop | URUWORKS |
| .ODCCUBEFILE | Apache Software Foundation | File vari | OpenDocument 1 Chart | Apache OpenOffice | Apache Software Foundation |
| .ODF | Oracle Corporation | File vari | OpenDocument Formula | Apache OpenOffice | Apache Software Foundation |
| .ODK | Unknown Developer | File vari | Uncommon File Extension | Unknown Software | Unknown Developer |
| .ODTX | Unknown Developer | File vari | Unknown File Type | Unknown Software | Unknown Developer |
| .OED | Unknown Developer | File vari | Uncommon File Extension | Unknown Software | Unknown Developer |
| .OF | Unknown Developer | File vari | Unknown File Type | Unknown Software | Unknown Developer |
| .OFL_EN | Unknown Developer | File vari | Unknown File Type | Unknown Software | Unknown Developer |
| .OLB | Microsoft Corporation | File vari | OLE Object Library | Microsoft Excel | Microsoft Corporation |
| .ON | Unknown Developer | File vari | Unknown File Type | Unknown Software | Unknown Developer |
| .ONION | Unknown Developer | File vari | Dharma Ransomware Affected Data | Unknown Software | Unknown Developer |
| .ONR | Unknown Developer | File vari | Uncommon File Extension | Unknown Software | Unknown Developer |
| .OO | Open Source | File vari | Free Pascal Object File For OS/2 Version | Free Pascal | Open Source |
| .OOK | Michal Polak | File vari | Arachne Batch Script | Arachne | Michal Polak |
| .OPF | E-Book Systems | File vari | FlipViewer FlipBook File | FlipViewer | E-Book Systems |
| .ORCA | Unknown Developer | File vari | Unknown Apple II Data File | Unknown Software | Unknown Developer |
| .OSA | Symantec Corporation | File vari | W32/Sober-AD File | AVG Antivirus | AVG Technologies |
| .OST | Microsoft Corporation | File vari | Outlook Offline Data File | Microsoft Outlook 2016 | Microsoft Corporation |
| .OTC | Apache Software Foundation | File vari | OpenDocument Chart Template | Apache OpenOffice | Apache Software Foundation |
| .OUB | Unknown Developer | File vari | Uncommon File Extension | Unknown Software | Unknown Developer |
| .OUF | Unknown Developer | File vari | Unknown File Type | Unknown Software | Unknown Developer |
| .OUI | Unknown Developer | File vari | Unknown File Type | Unknown Software | Unknown Developer |
| .OUR | Unknown Developer | File vari | Uncommon File Extension | Unknown Software | Unknown Developer |
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