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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .U3P | SanDisk Corporation | Executable Files | U3 Platform Install Data File | WinZip | Corel |
| .UAS | Ulead Systems | Backup Files | Ulead PhotoImpact Backup File | PhotoImpact | Corel |
| .UCG | Corel Corporation | Graphic Files | CG Infinity Graphic | Ulead MediaStudio | Corel |
| .UDI | Pinnacle Systems Inc. | Uncommon Files | Dazzle DVD Complete File | CorelDRAW Graphics Suite | Corel |
| .UEZ | Ulead Systems | Graphic Files | Ulead COOL 3D Image | MotionStudio 3D | Corel |
| .UFO | Ulead Systems | Raster Image Files | Ulead File Object | PhotoImpact | Corel |
| .UG | Autodesk, Inc. | Vector Image Files | Drawing File | CorelDRAW Graphics Suite | Corel |
| .UOL | Ulead Systems | Graphic Files | PhotoImpact Clipart Image | PhotoImpact | Corel |
| .UP2 | Ulead Systems | Uncommon Files | Ulead Cool 3D Plugins Board File | MotionStudio 3D | Corel |
| .UPD | Various Developers | Text Files | Program Update Information | Corel WordPerfect | Corel |
| .UPJ | Ulead Systems | Data Files | Ulead Project File | Burn.Now | Corel |
| .USTAR | Smith Micro Software | Data Files | Uniform Standard Tape Archive Format File | Corel WinZip 21 | Corel |
| .UU | Open Source | Encoded Files | Uuencoded File | Corel WinZip 21 | Corel |
| .UUE | Open Source | Encoded Files | Uuencoded File | Corel WinZip 21 | Corel |
| .UVP | Corel | Data Files | Ulead MediaStudio Data File+ | Ulead MediaStudio | Corel |
| .UWL | Corel | Data Files | User Word List File | Corel WordPerfect X8 | Corel |
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