| Extension | File Description |
| .UHX | Uncommon Files |
| .UHY | Uncommon Files |
| .UHZ | Uncommon Files |
| .UI0 | Uncommon Files |
| .UI1 | Uncommon Files |
| .UI2 | Uncommon Files |
| .UI3 | Uncommon Files |
| .UI4 | Uncommon Files |
| .UI5 | Uncommon Files |
| .UI6 | Uncommon Files |
| .UI7 | Uncommon Files |
| .UI8 | Uncommon Files |
| .UI9 | Uncommon Files |
| .UIA | Uncommon Files |
| .UIB | Uncommon Files |
| .UIC | Uncommon Files |
| .UID | Uncommon Files |
| .UIE | Uncommon Files |
| .UIG | Uncommon Files |
| .UIH | Uncommon Files |
| .UII | Uncommon Files |
| .UIJ | Uncommon Files |
| .UIK | Uncommon Files |
| .UIL | Uncommon Files |
| .UIM | Uncommon Files |
| .UIN | Uncommon Files |
| .uindex | Uncommon Files |
| .UIO | Uncommon Files |
| .UIP | Uncommon Files |
| .UIQ | Uncommon Files |
| .UIR | Uncommon Files |
| .UIT | Uncommon Files |
| .UIU | Uncommon Files |
| .UIV | Uncommon Files |
| .UIW | Uncommon Files |
| .UIX | Uncommon Files |
| .UIY | Uncommon Files |
| .UIZ | Uncommon Files |
| .UJ0 | Uncommon Files |
| .UJ1 | Uncommon Files |
| .UJ2 | Uncommon Files |
| .UJ3 | Uncommon Files |
| .UJ4 | Uncommon Files |
| .UJ5 | Uncommon Files |
| .UJ6 | Uncommon Files |
| .UJ7 | Uncommon Files |
| .UJ8 | Uncommon Files |
| .UJ9 | Uncommon Files |
| .UJA | Uncommon Files |
| .UJB | Uncommon Files |
| .UJC | Uncommon Files |
| .UJD | Uncommon Files |
| .UJE | Uncommon Files |
| .UJF | Uncommon Files |
| .UJG | Uncommon Files |
| .UJH | Uncommon Files |
| .UJI | Uncommon Files |
| .UJJ | Uncommon Files |
| .UJK | Uncommon Files |
| .UJL | Uncommon Files |
| .UJM | Uncommon Files |
| .UJN | Uncommon Files |
| .UJO | Uncommon Files |
| .UJP | Uncommon Files |
| .UJQ | Uncommon Files |
| .UJR | Uncommon Files |
| .UJS | Uncommon Files |
| .UJT | Uncommon Files |
| .UJU | Uncommon Files |
| .UJV | Uncommon Files |
| .UJW | Uncommon Files |
| .UJX | Uncommon Files |
| .UJY | Uncommon Files |
| .UJZ | Uncommon Files |
| .UK0 | Uncommon Files |
| Extension | File Description |
| .UK1 | Uncommon Files |
| .UK2 | Uncommon Files |
| .UK3 | Uncommon Files |
| .UK4 | Uncommon Files |
| .UK5 | Uncommon Files |
| .UK6 | Uncommon Files |
| .UK7 | Uncommon Files |
| .UK8 | Uncommon Files |
| .UK9 | Uncommon Files |
| .UKA | Uncommon Files |
| .UKB | Uncommon Files |
| .UKC | Uncommon Files |
| .UKD | Uncommon Files |
| .UKE | Uncommon Files |
| .UKF | Uncommon Files |
| .UKG | Uncommon Files |
| .UKH | Uncommon Files |
| .UKI | Uncommon Files |
| .UKJ | Uncommon Files |
| .UKK | Uncommon Files |
| .UKL | Uncommon Files |
| .UKM | Uncommon Files |
| .UKN | Uncommon Files |
| .UKO | Uncommon Files |
| .UKP | Uncommon Files |
| .UKQ | Uncommon Files |
| .UKR | Uncommon Files |
| .UKS | Uncommon Files |
| .UKT | Uncommon Files |
| .UKU | Uncommon Files |
| .UKV | Uncommon Files |
| .UKW | Uncommon Files |
| .UKY | Uncommon Files |
| .UKZ | Uncommon Files |
| .UK_ | Uncommon Files |
| .UL | Uncommon Files |
| .UL0 | Uncommon Files |
| .UL1 | Uncommon Files |
| .UL2 | Uncommon Files |
| .UL3 | Uncommon Files |
| .UL4 | Uncommon Files |
| .UL5 | Uncommon Files |
| .UL6 | Uncommon Files |
| .UL7 | Uncommon Files |
| .UL8 | Uncommon Files |
| .UL9 | Uncommon Files |
| .ULA | Uncommon Files |
| .ULB | Uncommon Files |
| .ULC | Uncommon Files |
| .ULD | Uncommon Files |
| .ULE | Uncommon Files |
| .ULG | Uncommon Files |
| .ULH | Uncommon Files |
| .ULI | Uncommon Files |
| .ULJ | Uncommon Files |
| .ULK | Uncommon Files |
| .ULL | Uncommon Files |
| .ULM | Uncommon Files |
| .ULN | Uncommon Files |
| .ULO | Uncommon Files |
| .ULP | Uncommon Files |
| .ULQ | Uncommon Files |
| .ULR | Uncommon Files |
| .ULU | Uncommon Files |
| .ULV | Uncommon Files |
| .ULX | Uncommon Files |
| .ULY | Uncommon Files |
| .UM | Uncommon Files |
| .UM0 | Uncommon Files |
| .UM1 | Uncommon Files |
| .UM2 | Uncommon Files |
| .UM3 | Uncommon Files |
| .UM4 | Uncommon Files |
| .UM5 | Uncommon Files |
| .UM6 | Uncommon Files |
