| .AC3 | Various Developers | 音頻檔案 | Audio Codec 3 File | Microsoft Windows Media Player | Microsoft Corporation |
| .ADPCM | Microsoft Corporation | 音頻檔案 | ADPCM Audio | Microsoft Windows Media Player | Microsoft Corporation |
| .ADT | Swiftpage, Inc. | 資料檔案 | ACT! Document Template | Microsoft Windows Media Player | Microsoft Corporation |
| .ADTS | Shedworx | 音頻檔案 | Audio Data Transport Stream File | Microsoft Windows Media Player | Microsoft Corporation |
| .AIF | Apple | 音頻檔案 | Audio Interchange File Format | Microsoft Windows Media Player | Microsoft Corporation |
| .AIFC | Apple | 音頻檔案 | Compressed Audio Interchange File | Microsoft Windows Media Player | Microsoft Corporation |
| .AIFF | Apple | 音頻檔案 | Audio Interchange File Format | Microsoft Windows Media Player | Microsoft Corporation |
| .APL | Matthew T. Ashland | 音頻檔案 | Monkey's Audio Track Information File | Microsoft Windows Media Player | Microsoft Corporation |
| .ASF | Microsoft Corporation | 視頻檔案 | Advanced Systems Format File | Microsoft Windows Media Player | Microsoft Corporation |
| .ASX | Microsoft Corporation | 視頻檔案 | Microsoft ASF Redirector File | Microsoft Windows Media Player | Microsoft Corporation |
| .AU | Open Source | 音頻檔案 | Audacity Audio File | Microsoft Windows Media Player | Microsoft Corporation |
| .AVI | Microsoft Corporation | 視頻檔案 | Audio Video Interleave File | Microsoft Windows Media Player | Microsoft Corporation |
| .AX | Open Source | 插件檔案 | DirectShow Filter | Microsoft Windows Media Player | Microsoft Corporation |
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