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of 1 | File Extension | File Type | File Format | Associated Programs | File Types Associated |
|---|---|---|---|---|
| U3I | U3 Application Information File | Text Files | 1 | 1 |
| UDF | Universal Disk Format Image File | Text Files | 15 | 6 |
| UNX | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Text Files | 3 | 3 |
| UOF | Uniform Office Document | Text Files | 2 | 1 |
| UPD | Program Update Information | Text Files | 22 | 5 |
| UPDF | UltraPdf Publication File | Text Files | 1 | 1 |
| UPM | PenMail Document | Text Files | 1 | 1 |
| USE | Log File | Text Files | 7 | 3 |
| UTXT | Unicode Text File | Text Files | 5 | 1 |
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