| ygn | yGen Project |
| ymw | Yaskawa MPE720 v6 Project |
| ymw7 | Yaskawa MPE720 v7 Project |
| ypr | BYOB Project |
| yw2 | yWriter Project |
| yw3 | yWriter Project |
| yw4 | yWriter Project |
| yw5 | yWriter Project |
| yw6 | yWriter Project |
| ywp | yWriter Project |
| yyp | GameMaker Studio 2 Project |
| yyz | GameMaker Studio 2 Exported Project |
| z13 | EPLAN 5 E-mail Project |
| zae | ZAwinEHE Project |
| zap12 | Siemens TIA v12 Archived Project |
| zap13 | Siemens TIA v13 Archived Project |
| zap14 | TIA Portal v14 Compressed Project |
| zap15 | TIA Portal v15 Compressed Project |
| zap16 | TIA Portal v16 Compressed Project |
| zbi | ZBI Developer Project |
| zbn | ScadaWorks Exported Project Archive |
| zbp | ScadaWorks Project Archive |
| zct | BasicCard Terminal Program Project |
| zdp | Avery DesignPro Project |
| zel | Zelio Soft Project |
| zero | Zero Compiler Project |
| zfprj | Z+F LaserControl Project |
| zgeproj | ZGameEditor Project |
| zld | Data File Manager ZLD Project |
| zmk | Z-Up Maker Project |
| zn | ZNwinEHE Project |
| znv | Data File Manager ZNV Project |
| zpj | Zephyr Eclipse Server Project |
| zpproj | ZennoPoster Project |
| zpproject | Zeta Producer Project |