| olb | Microsoft Office OLE Object Library |
| olb | 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 |
| olg | 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 |
