| pwo | WinNonlin Workbook Object |
| pwr | XPower Analyzer Report |
| pwre | PasswordTools Data |
| pwrep | Password Repository Data |
| pws | Corel Painter Workspace Data |
| pws | ProWorks Data |
| pwt | ProShow Producer Wizard Theme |
| pww | Patternland Weave Simulator Data |
| pwx | PowerAgent Exported Workout |
| px | ETCBC Parsed Text Data |
| px | Paradox Primary Index File |
| px | PC-Axis Statistical Data |
| px | Photodex ProShow Streaming Video |
| px | PX Submission Summary Data |
| px3 | PhraseExpress Phrase Data |
| px5 | Clone Manager Primer Collection Data |
| pxa | PhraseExpress for Android Phrase Data |
| pxa | XpressAccounts Data |
| pxb | Pixelmator Brush File |
| pxc | Photodex ProShow Cache |
| pxc | PX-Edit Classification Data |
| pxd | PXLab Design |
| pxf | PhotoArchiver Thumbnail Cache Data |
| pxg | Pixelmator Gradient File |
| pxi | PhraseExpress for iOS Phrase Data |
| pxicon | CandyBar Icon |
| pxip | Pixelmator Image Preset |
| pxk | PX-Edit Data |
| pxls | Pixelmator Layer Style File |
| pxml | Pandora PXML Data |
