| ogs | Origin LabTalk Script File |
| Origons Movie Data |
| ogw | Origin Worksheet Data |
| ogwu | Origin Unicode Worksheet Data |
| oh | DrillAssistant List Data |
| oh4 | Overhoor List Data |
| oha | Ohanae Encrypted Data for Sharing |
| ohanae | Ohanae Encrypted Data for Privat Use |
| ohs | Bink Outbound History Data |
| ohsd | HealthFrame OpenHealth Service Plug-in |
| oht | Oracle Help for Java Links Data |
| ohw | DrillAssistant List Data |
| oid | HP ProCurve Manager Network Device Data |
| oif | Origin Import Filter File |
| oik | Lenne3D Plant Distribution Data |
| ois | Origin Analysis Theme Data |
| oit | SleepScan and Ceegraph Offset Index Data |
| oix | Lenne3D Plant Distribution Data |
| oj | Atari Jaguar DSP Object Module |
| ojp | 3WayPack Output |
| ojz | Océ Publisher Compressed Job |
| ok | Dot OK MD5 Hash |
| IBM Content Navigator Completed Task Log |
| okd | Lenovo OneKey Recovery Data |
| okm | Open Knowledge Management Script |
| okozo | Okozo Desktop Animation Data |
| okp | srDraw Dynamic Image Data |
| okr | PowerRecover One Key Recovery File |
| ol | Altair FEKO Charges Data |
| olb | Cadence OrCAD Binary Library Database |
| Microsoft Office OLE Object Library |
| PSpice Capture Symbols Model |
| olb2 | CanOpener Library |
| ole2 | Microsoft Office OLE2 Stream |
| olecf | OLE 2 Compound File |
| oledata | Microsoft Office Rendering Data |
| olg | OATS Log File |
| Orbit Legend Data |
| olif | Open Lexicon Interchange Format |
| olk | Microsoft Outlook Address Book |
| olk14 | Microsoft Outlook for Mac Message Data |
| olk14arrange | Microsoft Office Outlook for Mac Arrange Data |
| olk14category | Microsoft Office Outlook for Mac Category Data |
| olk14contact | Microsoft Office Outlook for Mac Contacts Data |
| olk14event | Microsoft Office Outlook for Mac Events Data |
| olk14exmoves | Microsoft Office Outlook for Mac Data |
| olk14folder | Microsoft Office Outlook for Mac Folder Data |
| olk14group | Microsoft Office Outlook for Mac Group Data |
| olk14message | Microsoft Office Outlook for Mac Message Pointer |
| olk14msgsource | Microsoft Office Outlook for Mac Message Data |
| olk14note | Microsoft Office Outlook for Mac Note |
| olk14recent | Microsoft Office Outlook for Mac Recent Address Data |
| olk14rule | Microsoft Office Outlook for Mac Rule Data |
| olk14search | Microsoft Office Outlook for Mac Search Data |
| olk14signature | Microsoft Office Outlook for Mac Signature |
| olk14task | Microsoft Office Outlook for Mac Task Data |
| olk14uid | Microsoft Office Outlook for Mac UID Data |
| olk15event | Microsoft Office Outlook for Mac Events Data |
| olk15search | Microsoft Office Outlook for Mac Search Data |
| oll | TrialDirector Batch Load Data |
| olm | Microsoft Office Outlook for Mac Database |
| ols | Microsoft Office List Shortcut Data |
| WinOLS OLS Data |
| olt | Orbit Downloader List Data |
| olx | Open Learning XML Data |
| oly | Act! Opportunities Layout |
| AFP Overlay Resource |
| om | STK Owner/Mission File |
| om3 | HALCON Object Model 3D Data |
| omar | SOCSIM Output Marriage File |
| omb | Omnibus Offline Web Storage Data |
| omc | System Center Operations Manager Console Data |
| omcs | Office Manager SQL Archive |
| omd | Routing J Server Data |
| omeg | Mathematica for Mac OMEG Data |
| omf | Open Media Framework File |
| Routing J Server Routing Data |
| omfi | Open Media Framework File |
| omlog | CA OM Web Viewer Log |
| omm | OptiMatrix Maker Data |
