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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .Y01 | Corel Corporation | Data Files | Corel Paradox Secondary Index | Corel WordPerfect X8 | Corel |
| .Y02 | Corel Corporation | Data Files | Corel Paradox Secondary Index | Corel WordPerfect X8 | Corel |
| .Y04 | Corel Corporation | Data Files | Corel Paradox Secondary Index | Corel WordPerfect X8 | Corel |
| .Y05 | Corel | Data Files | Corel Paradox Secondary Index Data File | Corel Paradox | Corel |
| .Y07 | Corel Corporation | Data Files | Corel Paradox Secondary Index | Corel WordPerfect X8 | Corel |
| .YCD | Alexander Yee | Data Files | Y-Cruncher Data | Y-Cruncher | Alexander Yee |
| .YG0 | Corel Corporation | Data Files | Corel Paradox Secondary Index | Corel WordPerfect X8 | Corel |
| .YG1 | Corel Corporation | Data Files | Corel Paradox Secondary Index | Corel WordPerfect X8 | Corel |
| .YG3 | Corel Corporation | Data Files | Corel Paradox Secondary Index | Corel WordPerfect X8 | Corel |
| .YKA | Crocodile Clips Ltd | Data Files | Yenka Model File | Crocodile Clips Yenka | Crocodile Clips Ltd |
| .YLD | Ag Leader Technology | Data Files | Yield Monitor Data File | SMS Software | Ag Leader Technology |
| .YLT | Costas stergiou | Data Files | The Word & Bible Companion Young's Literal Translation Bible File | theWord | Costas stergiou |
| .YSE | Yamaha Corporation | Data Files | Yamaha Studio Manager Session Data | Yamaha Studio Manager | Yamaha Corporation |
| .YSM | Yamaha Corporation | Data Files | Yamaha Studio Manager Session Data | Yamaha Studio Manager | Yamaha Corporation |
| .YSS | YcySoft | Data Files | YcySoft Screen Saver Producer Data | Screen Saver Producer | YcySoft |
| .YTR | IRIS | Data Files | I.R.I.S. OCR Data | Readiris | IRIS |
| .YYC | Unknown Developer | Data Files | Wave Sapphire Distribution File | Unknown Software | Unknown Developer |
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