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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .Y2 | Michael J. Roberts | Uncommon Files | TADS Interactive Fiction Development GUI File | TADS | Michael J. Roberts |
| .YAD | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .YEAH | DigiSoft Innovations | Uncommon Files | An Unknown Apple II File | Golden Orchard | DigiSoft Innovations |
| .YES | Yuku | Uncommon Files | Quick Bible Document | Quick Bible | Yuku |
| .YIN | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .YJF | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .YKI | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .YLM | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .YNM | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .YPK | MicroSim Corporation | Uncommon Files | MicroSim PCBoard Mapping File | PCBoard | Clark Development Company, Inc. |
| .YRA | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .YTS | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .YUF | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .YV | DigiSoft Innovations | Uncommon Files | An Unknown Apple II File | Golden Orchard | DigiSoft Innovations |
| .YZF | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
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