| nvs | Ceedo SmartPlayer Package Configuration |
| nzp | Noise Ninja Noise Profile |
| oce | OCE Database Connection File |
| oco | Open Color Format Palette |
| od2tcfg | SUMO od2trips Configuration |
| officeui | Microsoft Office UI Customization |
| olk14mailaccount | Microsoft Office Outlook for Mac Accounts Data |
| olk14pref | Microsoft Office Outlook for Mac Preferences |
| olsr | Olsrd Configuration |
| omc | Origin Custom Menu Configuration |
| onc | Open Network Configuration Data |
| onpreset | Perfect Effects Preset Data |
| oodbrp | O&O Defrag GUI Settings Data |
| opax | Microsoft Office User Settings File |
| opn | Opera Optimizer Settings |
| ops | Microsoft Office Profile Settings Data |
| opt | MySQL Server Database Options Data |
| options | SE-DesktopApps Configuration |
| opts | Linux Configuration Options |
| ora | Oracle Configuration |
| osd | Directory Opus Configuration |
| osdx | Search Connector Description |
| otoconfig | OTOsuite Configuration Data |
| ovpn | OpenVPN Configuration |
| p2k | WinPCD T2 Configuration |
| p2x | PC-DMIS to Excel Settings Data |
| p3e | Adobe Photoshop Repousse Settings |
| p3l | Adobe Photoshop Light Preset |
| p3m | Adobe Photoshop Material Preset |
| p3r | Adobe Photoshop Render Settings Preset |
