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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .UMF | GetMediaHolder.com | Data Files | MediaHolder Universal Media Format File | Microsoft Notepad | Microsoft Corporation |
| .UPD | Various Developers | Text Files | Program Update Information | Microsoft Notepad | Microsoft Corporation |
| .URI | Microsoft Corporation | Data Files | List Of Uniform Resource Identifiers | Microsoft Notepad | Microsoft Corporation |
| .URL | Microsoft Corporation | Web Files | Internet Shortcut | Microsoft Notepad | Microsoft Corporation |
| .USA | Microsoft Corporation | Data Files | American English Localization Language File | Microsoft Notepad | Microsoft Corporation |
| .USE | Unknown Developer | Text Files | Log File | Microsoft Notepad | Microsoft Corporation |
| .USER | Microsoft Corporation | Settings Files | Visual Studio Project User Options File | Microsoft Notepad | Microsoft Corporation |
| .USF | EVGA Corporation | Settings Files | EVGA Precision X Skin File | Microsoft Notepad | Microsoft Corporation |
| .USR | FileMaker Inc. | Database Files | FileMaker Pro Database File | Microsoft Notepad | Microsoft Corporation |
| .UTXT | Open Source | Text Files | Unicode Text File | Microsoft Notepad | Microsoft Corporation |
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