Bestandsextensies beginnen met karakter 'Y'
| File Type | Categorie | File Format | |
|---|---|---|---|
| .y4m | Digital Video Files | YUV4MPEG2 Video File | |
| .yam | Data Files | Yahoo! Veilingen gegevens | |
| .ychat | Data Files | Yahoo! Messenger Chat Log | |
| .ygf | Data Files | Y Graph File Format | |
| .yml | Development Files | YAML Document |