| Extension | File Description |
| .ALLIANCE | Uncommon Files |
| .ALLOCM | Uncommon Files |
| .ALM | Uncommon Files |
| .ALN | Uncommon Files |
| .ALO | Uncommon Files |
| .ALONE | Uncommon Files |
| .ALP | Plugin Files |
| .ALPHA | Uncommon Files |
| .ALPHAB | Uncommon Files |
| .ALQ | Uncommon Files |
| .ALR | Game Files |
| .ALS | Audio Files |
| .ALT | Misc Files |
| .ALTO | Uncommon Files |
| .ALU | Uncommon Files |
| .ALV | Settings Files |
| .ALW | Uncommon Files |
| .ALX | Web Files |
| .ALY | Uncommon Files |
| .ALYSIS | Uncommon Files |
| .ALZ | Compressed Files |
| .AL_ | Uncommon Files |
| .AM | Developer Files |
| .AM0 | Uncommon Files |
| .AM1 | Game Files |
| .AM2 | Uncommon Files |
| .AM3 | Uncommon Files |
| .AM4 | Developer Files |
| .AM5 | Developer Files |
| .AM6 | Developer Files |
| .AM7 | Uncommon Files |
| .AM8 | Uncommon Files |
| .AM9 | Uncommon Files |
| .AMA | Uncommon Files |
| .AMAT | Uncommon Files |
| .AMAYA | Uncommon Files |
| .AMB | Data Files |
| .AMC | Data Files |
| .AMD | Uncommon Files |
| .AME | Uncommon Files |
| .AMERICA | Uncommon Files |
| .AMF | Audio Files |
| .AMFF | Uncommon Files |
| .AMG | Uncommon Files |
| .AMH | Uncommon Files |
| .AMI | Uncommon Files |
| .AMIGA | Uncommon Files |
| .AMJ | Uncommon Files |
| .AMK | Uncommon Files |
| .AML | System Files |
| .AMM | Uncommon Files |
| .AMN | Uncommon Files |
| .AMO | Uncommon Files |
| .AMODEL | Uncommon Files |
| .AMOS | Uncommon Files |
| .AMP | Settings Files |
| .AMPER | Uncommon Files |
| .AMQ | Uncommon Files |
| .AMR | Audio Files |
| .AMS | Audio Files |
| .AMSM | Uncommon Files |
| .AMST | Uncommon Files |
| .AMT | Uncommon Files |
| .AMU | Uncommon Files |
| .AMV | Video Files |
| .AMW | Uncommon Files |
| .AMX | Plugin Files |
| .AMXX | Plugin Files |
| .AMY | Uncommon Files |
| .AMZ | Music Files |
| .AN | Uncommon Files |
| .AN0 | Uncommon Files |
| .AN1 | Data Files |
| .AN2 | Uncommon Files |
| .AN3 | Uncommon Files |
| Extension | File Description |
| .AN4 | Uncommon Files |
| .AN5 | Uncommon Files |
| .AN6 | Uncommon Files |
| .AN7 | Uncommon Files |
| .AN8 | 3D Image Files |
| .AN9 | Uncommon Files |
| .ANA | Uncommon Files |
| .ANAL | Uncommon Files |
| .ANALASIS | Uncommon Files |
| .ANAT | Uncommon Files |
| .ANB | Uncommon Files |
| .ANC | Uncommon Files |
| .ANCESTRY | Uncommon Files |
| .AND | Uncommon Files |
| .ANE | Uncommon Files |
| .ANF | Uncommon Files |
| .ANG | Uncommon Files |
| .ANGELES | Uncommon Files |
| .ANH | Uncommon Files |
| .ANI | System Files |
| .ANIM | 3D Image Files |
| .ANIM3 | Uncommon Files |
| .ANIM5 | Uncommon Files |
| .ANIM50 | Uncommon Files |
| .ANIMAL | Uncommon Files |
| .ANIMALS1 | Uncommon Files |
| .ANIMALS2 | Uncommon Files |
| .ANIMALS3 | Uncommon Files |
| .ANIMASIA | Uncommon Files |
| .ANIMATION | Uncommon Files |
| .ANIMDEMO | Uncommon Files |
| .ANIMTOOL | Uncommon Files |
| .ANJ | Uncommon Files |
| .ANK | Uncommon Files |
| .ANKI | Uncommon Files |
| .ANL | Uncommon Files |
| .ANM | 3D Image Files |
| .ANN | System Files |
| .ANNOT | Misc Files |
| .ANO | Uncommon Files |
| .ANP | Uncommon Files |
| .ANQ | Uncommon Files |
| .ANR | Uncommon Files |
| .ANS | Data Files |
| .ANS2 | Uncommon Files |
| .ANSR | Uncommon Files |
| .ANT | Uncommon Files |
| .ANTIFRAG | Uncommon Files |
| .ANU | Uncommon Files |
| .ANV | Uncommon Files |
| .ANW | Uncommon Files |
| .ANX | Data Files |
| .ANY | Uncommon Files |
| .ANYDVD | Uncommon Files |
| .ANZ | Uncommon Files |
| .AO | Uncommon Files |
| .AO0 | Uncommon Files |
| .AO1 | Uncommon Files |
| .AO2 | Uncommon Files |
| .AO3 | Uncommon Files |
| .AO4 | Uncommon Files |
| .AO5 | Uncommon Files |
| .AO6 | Uncommon Files |
| .AO7 | Uncommon Files |
| .AO8 | Uncommon Files |
| .AO9 | Uncommon Files |
| .AOA | Uncommon Files |
| .AOB | Audio Files |
| .AOC | Uncommon Files |
| .AOD | Uncommon Files |
| .AOE | Uncommon Files |
| .AOF | Uncommon Files |
| .AOG | Uncommon Files |
| .AOH | Uncommon Files |
| .AOI | 3D Image Files |
