| Extension | File Description |
| .UQD | Uncommon Files |
| .UQE | Uncommon Files |
| .UQF | Uncommon Files |
| .UQG | Uncommon Files |
| .UQH | Uncommon Files |
| .UQI | Uncommon Files |
| .UQJ | Uncommon Files |
| .UQK | Uncommon Files |
| .UQL | Uncommon Files |
| .UQN | Uncommon Files |
| .UQO | Uncommon Files |
| .UQP | Uncommon Files |
| .UQQ | Uncommon Files |
| .UQR | Uncommon Files |
| .UQS | Uncommon Files |
| .UQT | Uncommon Files |
| .UQU | Uncommon Files |
| .UQV | Uncommon Files |
| .UQW | Uncommon Files |
| .UQX | Uncommon Files |
| .UQY | Uncommon Files |
| .UQZ | Uncommon Files |
| .UR0 | Uncommon Files |
| .UR1 | Uncommon Files |
| .UR2 | Uncommon Files |
| .UR3 | Uncommon Files |
| .UR4 | Uncommon Files |
| .UR5 | Uncommon Files |
| .UR6 | Uncommon Files |
| .UR7 | Uncommon Files |
| .UR8 | Uncommon Files |
| .UR9 | Uncommon Files |
| .URA | Uncommon Files |
| .URB | Uncommon Files |
| .URBS | Uncommon Files |
| .URC | Uncommon Files |
| .URD | Uncommon Files |
| .URD-JOURNA | Uncommon Files |
| .URE | Uncommon Files |
| .URF | Uncommon Files |
| .URG | Uncommon Files |
| .URH | Uncommon Files |
| .URI | Uncommon Files |
| .URIS | Uncommon Files |
| .URJ | Uncommon Files |
| .URK | Uncommon Files |
| .URLS | Uncommon Files |
| .URM | Uncommon Files |
| .URN | Uncommon Files |
| .URO | Uncommon Files |
| .URP | Uncommon Files |
| .URQ | Uncommon Files |
| .URR | Uncommon Files |
| .URS | Uncommon Files |
| .URU | Uncommon Files |
| .URV | Uncommon Files |
| .URW | Uncommon Files |
| .URX | Uncommon Files |
| .URY | Uncommon Files |
| .URZ | Uncommon Files |
| .US | Uncommon Files |
| .US0 | Uncommon Files |
| .US1 | Uncommon Files |
| .US2 | Uncommon Files |
| .US3 | Uncommon Files |
| .US4 | Uncommon Files |
| .US5 | Uncommon Files |
| .US6 | Uncommon Files |
| .US7 | Uncommon Files |
| .US8 | Uncommon Files |
| .US9 | Uncommon Files |
| .USAGE | Uncommon Files |
| .USB | Uncommon Files |
| .USC | Uncommon Files |
| .USD | Uncommon Files |
| Extension | File Description |
| .USE | Uncommon Files |
| .USG | Uncommon Files |
| .USH | Uncommon Files |
| .USI | Uncommon Files |
| .USJ | Uncommon Files |
| .USK | Uncommon Files |
| .USL | Uncommon Files |
| .USM | Uncommon Files |
| .USN | Uncommon Files |
| .USO | Uncommon Files |
| .USP | Uncommon Files |
| .USQ | Uncommon Files |
| .USS | Uncommon Files |
| .UST | Uncommon Files |
| .USU | Uncommon Files |
| .USV | Uncommon Files |
| .USW | Uncommon Files |
| .USY | Uncommon Files |
| .USYM | Uncommon Files |
| .USZ | Uncommon Files |
| .UT0 | Uncommon Files |
| .UT1 | Uncommon Files |
| .UT4 | Uncommon Files |
| .UT5 | Uncommon Files |
| .UT6 | Uncommon Files |
| .UT7 | Uncommon Files |
| .UT8 | Uncommon Files |
| .UT9 | Uncommon Files |
| .UTA | Uncommon Files |
| .UTB | Uncommon Files |
| .UTD | Uncommon Files |
| .UTE | Uncommon Files |
| .UTF | Uncommon Files |
| .UTG | Uncommon Files |
| .UTH | Uncommon Files |
| .UTI | Uncommon Files |
| .UTIL | Uncommon Files |
| .UTIL2 | Uncommon Files |
| .UTILITIES | Uncommon Files |
| .UTILITY | Uncommon Files |
| .UTILS | Uncommon Files |
| .UTJ | Uncommon Files |
| .UTK | Uncommon Files |
| .UTL | Uncommon Files |
| .UTM | Uncommon Files |
| .UTMP | Uncommon Files |
| .UTN | Uncommon Files |
| .UTO | Uncommon Files |
| .UTP | Uncommon Files |
| .UTQ | Uncommon Files |
| .UTR | Uncommon Files |
| .UTS | Uncommon Files |
| .UTT | Uncommon Files |
| .UTU | Uncommon Files |
| .UTV | Uncommon Files |
| .UTY | Uncommon Files |
| .UU0 | Uncommon Files |
| .UU1 | Uncommon Files |
| .UU2 | Uncommon Files |
| .UU3 | Uncommon Files |
| .UU4 | Uncommon Files |
| .UU5 | Uncommon Files |
| .UU6 | Uncommon Files |
| .UU7 | Uncommon Files |
| .UU8 | Uncommon Files |
| .UU9 | Uncommon Files |
| .UUA | Uncommon Files |
| .UUB | Uncommon Files |
| .UUC | Uncommon Files |
| .UUCP | Uncommon Files |
| .UUF | Uncommon Files |
| .UUG | Uncommon Files |
| .UUH | Uncommon Files |
| .UUI | Uncommon Files |
| .UUJ | Uncommon Files |
