| pwk | Blackberry Password Keeper Data |
| pwm | ThinkVantage Password Manager Data |
| pwo | WinNonlin Workbook Object |
| pwr | XPower Analyzer Report |
| pwrep | Password Repository Data |
| pws | ProWorks Data |
| pwx | PowerAgent Exported Workout |
| px | Paradox Primary Index File |
| pxb | Pixelmator Brush File |
| pxc | Photodex ProShow Cache |
| pxd | PXLab Design |
| pxg | Pixelmator Gradient File |
| pxicon | CandyBar Icon |
| pxip | Pixelmator Image Preset |
| pxls | Pixelmator Layer Style File |
| pxp | IGOR Pro Packed Experiment File |
| pxs | Pixelmator Shape File |
| pxt | IGOR Pro Packed Experiment Template File |
| pyi | Cognos Model File |
| pyj | Cognos Model File |
| pyr | SOCSIM Population Pyramid File |
| pz2 | Poser Pose Data |
| pzr | Poser 2.0 Scene |
| pzs | Poser Link |
| p_b | Parasolid CAD Binary Partition Data |
| p_t | Parasolid CAD ASCII Partition Data |
| q | Q Engine Data |
| q07 | QuickTax 2007 Tax Return |
| q08 | QuickTax 2008 Tax Return |
| q09 | QuickTax 2009 Tax Return |
