| Abbreviation | Definition |
|---|---|
| OTL | Outline font description (Z-Soft Type Foundry) |
| OTL | Ventura Publisher's Type Foundry Outline Editor format |
| OTV | Off The Vine |
| OTX | Olivetti Olitext Plus Text file |
| OUT | Output |
| OV1 | Overlay file (part of program to be loaded when needed) |
| OV2 | Overlay file (part of program to be loaded when needed) |
| OVD | ObjectVision Datafile |
| OVL | Overlay file (part of program to be loaded when needed) |
| OVQ | OpenView miscellaneous |
| OVR | Overlay file (part of program to be loaded when needed) |
| OXM | Ogg-compressed XM |
| OZW | Wizard format |
| P | Applause picture Graphics file |
| P | Progress Database source code |
| P | ReaGeniX code generator Rea-C-Time application parameter file |
| P10 | Tektronix Plot 10 drawing |
| P16 | ProTracker Studio 16 16-channel Music file |
| P22 | Patch file (Patch22) |
| P65 | Document (PageMaker 6.5) |