List of Data File Formats Starting with the Letter "Y"
| .y | Yacc grammar file |
| Compressed Amiga file archive created by YABBA | |
| .y01 | Secondary index (Paradox) |
| .y02 | Secondary index (Paradox) |
| .y03 | Secondary index (Paradox) |
| .y04 | Secondary index (Paradox) |
| .y05 | Secondary index (Paradox) |
| .y06 | Secondary index (Paradox) |
| .y07 | Secondary index (Paradox) |
| .y08 | Secondary index (Paradox) |
| .y09 | Secondary index (Paradox) |
| .yab | Yabasic Source Code file |
| .yal | Data (Arts & Letters) |
| .ybk | Microsoft Encarta Yearbook file |
| .ychat | Yahoo! Messenger chat log |
| .yenc | yEnc file |
| .ymg | Yahoo! Messenger file |
| .yml | YAML file |
| .ync | yEnc Encoded file |
| .yps | Yahoo! Messenger Data file |
| .yuv | YUV Encoded Image or Video file |
| .yz | Compressed file archive created by YAC |
| .yz1 | Yamazaki ZIPPER file |
