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| Y | Grammar file (Yaac) |
| Y | Compressed Amiga archive (YABBA) |
| YAL | Clipart library (Arts & Letters) |
| YBK | Yearbook file (Microsoft Encarta) |
| YUV | Graphics file (YUV) |
| YZ | Compressed file archive (YAC) |
| Y01 | Secondary index file (Paradox) |
| Y02 | Secondary index file (Paradox) |
| Y03 | Secondary index file (Paradox) |
| Y04 | Secondary index file (Paradox) |
| Y05 | Secondary index file (Paradox) |
| Y06 | Secondary index file (Paradox) |
| Y07 | Secondary index file (Paradox) |
| Y08 | Secondary index file (Paradox) |
| Y09 | Secondary index file (Paradox) |