| wve | Cyberlink WaveEditor Project |
| wve | Wondershare Filmora Project |
| wvp | MagicHTML Web Video Player Project |
| wvse | Wondershare Filmora for Mac Project |
| wwp | WebDev Project |
| wyg | Cast Soft wysiwyg Project |
| wyp | wyBuild Project |
| wyt | Cast Soft wysiwyg Template |
| wzx | Wizard MatDesigner Project Archive |
| xbp | ApSIC Xbench Project |
| xch | Link Assistant Project |
| xclp | Microsoft Research Cliplets Project |
| xcode | Xcode Project |
| xcodeproj | Xcode Project |
| xda | Sencha Architect Project Archive |
| xer | Primavera P6 Project |
| xgll | EASE SpeakerLab Project |
| xise | Xilinx ISE Project |
| xjp | Jindent Project File |
| xmfg | MediaForge Runtime Player Distribution Project |
| xmk | Crossware Embedded Development Studio Project |
| xml | Cinelerra Video Project |
| xmp | Xilinx Microprocessor Project |
| xmp | XMap Project |
| xmpz | Miradi XML Project |
| xosm | PixInsight Project |
| xpf | Xpression Project |
| xpf | XProtector Project |
| xpgroup | Xpression Project Group |
| xpj | Adobe RoboHelp XML Project |
