| ptm | Portable Translation Memories |
| pubxml | Visual Studio Publish Profile XML Data |
| pug | Pug Markup Language Document |
| puml | PlantUML Diagram |
| pvti | ParaView VTK Parallel Image Data |
| pvtp | ParaView VTK Parallel Poly Data |
| pvtr | ParaView VTK Parallel Rectilinear Grid |
| pvts | ParaView VTK Parallel Structured Grid |
| pvtu | ParaView VTK Parallel Unstructured Grid |
| pwl1 | SIMATIC WinCC PWL1 Data |
| pwn | Pawn Source Code |
| pxd | Pyrex Definition File |
| pxi | Pyrex Include File |
| pxx | Keyman Developer Encrypted Customisation File |
| py | Python Script |
| py2 | Python Script |
| py3 | Python Script |
| pyb | Brython Script |
| pye | SOURCEdefender Encrypted Script |
| pyf | F2PY Signature File |
| pym | Python Macro File |
| pyn | Pynguin Project |
| pynb | IPython Notebook Document |
| pyo | Python Optimized Code |
| pyp | AllPlan PythonParts Script |
| pyr | Python Repository |
| pyt | Python Declarations Data |
| pyw | Python Script |
| pyx | Pyrex Source |
| q | QL-R-kemi Unformatted Source |
| q7m | SAS 7 Sequential Engine DMDB Data |
| qa7 | SAS 7 Sequential Engine Access Descriptor Data |
| qbe | dBASE IV Saved Query |
| qbs | QuickBasic Source Code |
| qc | QuakeC Source Code |