List of All the File Extensions Formats and Types Starting With the Letter A
| File Extension | Type Description |
|---|---|
| A | ADA programming language source code |
| A00 | Split Multi-volume ARJ compressed archive (part 2) |
| A01 | Split Multi-volume ARJ compressed archive (part 3) |
| A02 | Split Multi-volume ARJ compressed archive (part 4) |
| A03 | Split Multi-volume ARJ compressed archive (part 5) |
| A04 | Split Multi-volume ARJ compressed archive (part 6) |
| A05 | Split Multi-volume ARJ compressed archive (part 7) |
| AAC | Advanced Audio Coding |
| AAE | Sidecar Image Edit |
| AAX | Audible enhanced audio |
| ABC | ABC Programming language |
| ABK | Ability Write backup |
| ABM | Album |
| ABR | Adobe Photoshop Brush |
| ABS | AB SuDoKu save game |
| ACD | alan game |
| ACH | eSignal |
| ACL | ArchiCrypt Live secured |
| ACP | Action! document |
| ACSM | Adobe Content Server Message |
| ACT | Action! presentation file |
| ACTION | Mac OS X Automator action |
| ACV | Adobe photoshop colour curves |
| ACX | Atari ST Program |
| ADC | ActiveDocs Clipping Catalog |
| ADF | A.R.S.E.N.A.L game |
| ADT | ACT! document template |
| AEP | Activ E-Book project |
| AES | Adobe After Effects Stabilizer settings
AES Crypt encrypted Google AdWords Editor sharing |
| AFA | Astrotite compressed data |
| AFC | Apple sound format |
| AFF | Acorn vector draw |
| AFM | Abassis data |
| AFP | Advanced Function Presentation data |
| AFR | FreeBSD |
| AI | Adobe Illustrator graphics |
| AID | ACDSee Classic thumbnail |
| AMR | Adaptive Multi-Rate compressed audio |
| APK | Android Package |
| ASPX | Active Server Page Extended ASP.NET script |
| AZ | WinDVD related |
| AZF | Secure format |
| AZW | Amazon Kindle eBook |
| AZW1 | Amazon Kindle |