| ovw | Cubase WAVE File Overview |
| owc | OutWit Hub OutWit Catch Database |
| owc | WAsP Observed Wind Climate |
| owf | OSRAM Waveform File |
| owg | OutWit Hub Gear Database |
| owm | OutWit Hub XML Mashup |
| owt | OneWorldTree Data |
| owx | OutWit Hub Script |
| oxb | OlapX Report Portfolio Data |
| oxc | OlapX Cube Definition |
| oxd | PS3 Proxy Server Data |
| oxe | Pulsar Z.matrix Data |
| oxf | Origin X-Function File |
| oxl | LITESTAR 4D Data File |
| oxml | OXML 2.0 Data |
| oxp | OmniRush eXtended Package |
| oyx | Lotus Approach Alternate Database Index |
| oz | Opera Job Management Compressed File |
| ozd | OZ Report Data |
| ozp | Sharp Wizard Phone Bank Data |
| p00 | Commodore 64 Program Image |
| p01 | MicroStation Modification Project Resource File |
| p02 | MicroStation Modification Project Resource File |
| p03 | MicroStation Modification Project Resource File |
| p04 | MicroStation Modification Project Resource File |
| p05 | MicroStation Modification Project Resource File |
| p06 | MicroStation Modification Project Resource File |
| p07 | MicroStation Modification Project Resource File |
| p08 | MicroStation Modification Project Resource File |
| p09 | MicroStation Modification Project Resource File |
| p10 | MicroStation Modification Project Resource File |
| p12 | PKCS #12 Data File |
| p1d | PLUS+1 GUIDE Data |
| p1i | IBM Voice Type Languages Newuser Data |
| p21 | Express STEP Data Model |