| 11. | .zfd | Zeroadic functions (ABC programming language) |
| 12. | .zfs | Assembler source code file (C,C++) |
| 13. | .zgm | Graphics (Zenographics) |
| 14. | .zinc | Bitmap graphics (Zinc Interface Library icon file) |
| 15. | .zip | Compressed file archive Formato de ficheros comprimido (InfoZIP - PKZip - WinZip) |
| 16. | .zom | Compressed Amiga file archive (Zoom) |
| 17. | .zoo | Compressed file archive (Zoo) |
| 18. | .zpd | Zeroadic predicates (ABC programming language) |
| 19. | .zrp | Rapid simulation package (Rapid) |
| 20. | .zsh | Unix shell script (zsh) |
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