| extension name | file type | Classification |
|---|---|---|
| Y | Yacc Source File | developer files |
| YAB | Yabasic Source Code | developer files |
| YAML | YAML Document | developer files |
| YML | YAML Document | developer files |
| YML2 | YML Script | developer files |
| YMP | YaST Metapackage File | developer files |
| YPR | BYOB Project File | developer files |