| Extension | File Description |
| .AP0 | Uncommon Files |
| .AP1 | Uncommon Files |
| .AP2 | Uncommon Files |
| .AP3 | Uncommon Files |
| .AP4 | Uncommon Files |
| .AP5 | Uncommon Files |
| .AP6 | Uncommon Files |
| .AP7 | Uncommon Files |
| .AP8 | Uncommon Files |
| .AP9 | Uncommon Files |
| .APB | Uncommon Files |
| .APC | Uncommon Files |
| .APF2 | Uncommon Files |
| .APG | Uncommon Files |
| .APIN | Uncommon Files |
| .APJ | Uncommon Files |
| .APLN | Uncommon Files |
| .APLWRKS | Uncommon Files |
| .APLWRKSGS | Uncommon Files |
| .APN | Uncommon Files |
| .APO | Uncommon Files |
| .APPL | Uncommon Files |
| .APPLE | Uncommon Files |
| .APPLE2 | Uncommon Files |
| .APPLESHARE | Uncommon Files |
| .APPLESOF | Uncommon Files |
| .APPLEWKS | Uncommon Files |
| .APPLICATIO | Uncommon Files |
| .APPM | Uncommon Files |
| .APPS | Uncommon Files |
| .APPT | Uncommon Files |
| .APQ | Uncommon Files |
| .APRJ | Uncommon Files |
| .APT | Uncommon Files |
| .APU | Uncommon Files |
| .APV | Uncommon Files |
| .APW | Uncommon Files |
| .APWKS | Uncommon Files |
| .APY | Uncommon Files |
| .AQ | Uncommon Files |
| .AQ0 | Uncommon Files |
| .AQ1 | Uncommon Files |
| .AQ2 | Uncommon Files |
| .AQ3 | Uncommon Files |
| .AQ4 | Uncommon Files |
| .AQ5 | Uncommon Files |
| .AQ6 | Uncommon Files |
| .AQ7 | Uncommon Files |
| .AQ8 | Uncommon Files |
| .AQ9 | Uncommon Files |
| .AQA | Uncommon Files |
| .AQB | Uncommon Files |
| .AQC | Uncommon Files |
| .AQD | Uncommon Files |
| .AQE | Uncommon Files |
| .AQF | Uncommon Files |
| .AQG | Uncommon Files |
| .AQH | Uncommon Files |
| .AQI | Uncommon Files |
| .AQJ | Uncommon Files |
| .AQK | Uncommon Files |
| .AQL | Uncommon Files |
| .AQM | Uncommon Files |
| .AQN | Uncommon Files |
| .AQO | Uncommon Files |
| .AQP | Uncommon Files |
| .AQQ | Uncommon Files |
| .AQR | Uncommon Files |
| .AQS | Uncommon Files |
| .AQT | Uncommon Files |
| .AQU | Uncommon Files |
| .AQV | Uncommon Files |
| .AQW | Uncommon Files |
| .AQX | Uncommon Files |
| .AQY | Uncommon Files |
| Extension | File Description |
| .AQZ | Uncommon Files |
| .AR0 | Uncommon Files |
| .AR1 | Uncommon Files |
| .AR2 | Uncommon Files |
| .AR3 | Uncommon Files |
| .AR4 | Uncommon Files |
| .AR4W | Uncommon Files |
| .AR5 | Uncommon Files |
| .AR6 | Uncommon Files |
| .AR7 | Uncommon Files |
| .AR8 | Uncommon Files |
| .AR9 | Uncommon Files |
| .ARA | Uncommon Files |
| .ARB | Uncommon Files |
| .ARCADE | Uncommon Files |
| .ARCANE | Uncommon Files |
| .ARCH | Uncommon Files |
| .ARCHIE | Uncommon Files |
| .ARCHIMEDES | Uncommon Files |
| .ARCHITECT | Uncommon Files |
| .ARE | Uncommon Files |
| .ARGO | Uncommon Files |
| .ARK3 | Uncommon Files |
| .ARKCHEAT | Uncommon Files |
| .ARLOLD | Uncommon Files |
| .ARM | Uncommon Files |
| .ARMADA | Uncommon Files |
| .ARMOURFONT | Uncommon Files |
| .ARMX | Uncommon Files |
| .ARMY | Uncommon Files |
| .ARN | Uncommon Files |
| .ARPX8 | Uncommon Files |
| .ARQ | Uncommon Files |
| .ARTGALLERY | Uncommon Files |
| .ARTICLE | Uncommon Files |
| .ARTICLE1 | Uncommon Files |
| .ARU | Uncommon Files |
| .ARV | Uncommon Files |
| .ARY | Uncommon Files |
| .ARZ | Uncommon Files |
| .AS0 | Uncommon Files |
| .AS1 | Uncommon Files |
| .AS2 | Uncommon Files |
| .AS3 | Uncommon Files |
| .AS5 | Uncommon Files |
| .AS6 | Uncommon Files |
| .AS7 | Uncommon Files |
| .AS8 | Uncommon Files |
| .AS9 | Uncommon Files |
| .ASG | Uncommon Files |
| .ASHDISK | Uncommon Files |
| .ASIC | Uncommon Files |
| .ASJ | Uncommon Files |
| .ASLQUERY | Uncommon Files |
| .ASM1 | Uncommon Files |
| .ASM2 | Uncommon Files |
| .ASM3 | Uncommon Files |
| .ASMDAT | Uncommon Files |
| .ASMVERS | Uncommon Files |
| .ASN | Uncommon Files |
| .ASN1 | Uncommon Files |
| .ASO | Uncommon Files |
| .ASPHTML | Uncommon Files |
| .ASPI | Uncommon Files |
| .ASPR | Uncommon Files |
| .ASQ | Uncommon Files |
| .ASSIGNED | Uncommon Files |
| .ASSOC | Uncommon Files |
| .AST2 | Uncommon Files |
| .ASTROGS | Uncommon Files |
| .ASU | Uncommon Files |
| .ASW | Uncommon Files |
| .ASXML | Uncommon Files |
| .ASZ | Uncommon Files |
| .AS_ | Uncommon Files |
