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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .UBJ | The Buzz Media | Data Files | Universal Binary JSON File | Universal Binary JSON Binary Java Library | GitHub, Inc. |
| .UM | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .UMF | GetMediaHolder.com | Data Files | MediaHolder Universal Media Format File | Atom | GitHub, Inc. |
| .UNIVERSAL3 | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .UNLOCK | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .UNX | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .USAGE | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .USE | Unknown Developer | Text Files | Log File | Atom | GitHub, Inc. |
| .USR | FileMaker Inc. | Database Files | FileMaker Pro Database File | Atom | GitHub, Inc. |
| .UTILITY | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .UTMP | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
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