| nxs | NEXUS Data File |
| nxs | Pioneer Rekordbox Profile |
| nxtheme | Nintendo Switch Theme Data |
| nyf | myBase Database |
| nyl | Novapoint Vertical Alignment Data |
| nzl | Corel Painter Nozzle Data |
| nzn | NoteZilla Notes Data |
| nzn | RMCProfile Nitrogen Zinc Neighbours Data |
| o2s | Oracle-to-MySQL Profile Description Data |
| o8c | OCTGN Card Image |
| o8d | OCTGN Deck Data |
| o8g | OCTGN Game Definition Data |
| o8o | Mediator 5 Repository Tabs Data |
| o8s | OCTGN Set Data |
| oa | Cadence OrCAD OpenAccess Data |
| oa | OpenAccess Database |
| oab | Microsoft Outlook Offline Address Book |
| oal | Forms Design Tool Pattern License Data |
| oam | Adobe Edge Animate Widget |
| oar | HSQLDB Database |
| oaw | OpenArchitectureWare Workflow Data |
| ob | IBM LinkWay Object |
| ob! | Orbit Downloader Unfinished File |
| ob3 | ORTIMzeit Data File |
| obc | AICON 3D Photogrammetry File |
| obd | Oracle Forms Online Help Data |
| obg | ZBrush Mesh Data |
| obi | Microsoft Outlook RSS Subscription Data |
| obj | Wavefront Object File |
| objf | STRIPE Object Data |
| obk | Cadence OrCAD Capture Design |
| obk | Genie Outlook Express Backup Data |
| obk | Oxygen Phone Manager Phone Book Data |
| obk | pCon.basket Project |
| obpack | ObjectBar Theme Package |
