| Extension | Description | File Type |
|---|
| a | Assembly Source Code File | Developer Files |
| aa | Audible Audio File | Audio Files |
| aac | Advanced Audio Coding | Audio Files |
| aax | Audible Audiobook File | Audio Files |
| abc | ActionScript Byte Code File | Developer Files |
| abk | CorelDraw Automatic Backup File | Backup Files |
| abk | Kodak EasyShare Addressbook File | Graphic Files |
| abm | Album file | Audio Files |
| abr | Adobe Photoshop brush File | Misc Files |
| abs | Absolute Database File | Data Files |
| abw | Abiword Document File | Document Files |
| ac3 | Audio Codec 3 File | Audio Files |
| accdb | Access Database File | Data Files |
| ace | WinAce Compressed File | Archived Files |
| acl | Microsoft Office Auto Correction File | Misc Files |
| acm | Photoshop Command Button File | Settings Files |
| acs | Microsoft Ring Animated Character File | Misc Files |
| acs2 | AIMP2 Media Player Skin File | Misc Files |
| acsm | Adobe Content Server Message File | Misc Files |
| act | ADPCM Audio File | Audio Files |
| action | Apple Automator Action File | Misc Files |
| ADADOWNLOAD | Adobe Download Assistant Partial File | Misc Files |
| adb | Alpha Five Database Information File | Data Files |
| adf | Data Coverage File | Geographical Files |
| adm | Administrative Template File | Settings Files |
| adr | Opera Bookmark File | Web Files |
| adx | ADX Encoded Audio File | Audio Files |
| aep | Adobe After Effects Project File | Multimedia Files |
| aex | Alpha Five Compiled File | Developer Files |
| aex | AFter Effects Plugin File | Plugin Files |
| afs | Adobe Type Manager font set | Fonts Files |
| ahk | AutoHotkey Script File | Executable Files |
| ai | Adobe Illustrator Artwork | Graphic Files |
| aif | Audio Interchange File Format | Audio Files |
| air | Adobe AIR Installation Package File | Executable Files |
| ajp | CCTV Video File | Video Files |
| al8 | AAA Logo Project File | Desktop Publishing |
| alb | Alpha Five Library File | Developer Files |
| alx | ActiveX Layout File | Settings Files |
| alz | ALZip Copmpressed File | Archived Files |
| amr | Adaptive Multi Rate Compressed File | Audio Files |
| amv | AMV Video File | Video Files |
| amx | After Effects Motion Exchange File | Video Files |
| amxx | Metamod Plugin File | Game Files |
| ani | Animated cursor File | System Files |
| ape | Monkey's Audio File | Audio Files |
| api | Adobe Acrobat Plugin Files | Misc Files |
| api | WebOjects API File | Misc Files |
| apk | Android Package File | Executable Files |
| apm | Aldus Placeable Metafile | Graphic Files |
| app | Symbian OS Application | Executable Files |
| application | ClickOnce Deployment Manifest | Executable Files |
| arc | Arc Lossless Data Compression File | Archived Files |
| arn | Sysinternals Saved Scan File | Misc Files |
| art | ART Image File | Graphic Files |
| aru | Malicious File | Misc Files |
| arw | Sony RAW File | Graphic Files |
| ary | SmartStart Scripting Toolkit File | Settings Files |
| as | ActionScript Source Code File | Web Files |
| asc | Adobe ActionScript Communication File | Developer Files |
| asd | Word AutoSave File | Backup Files |
| asec | Secure Application File | Misc Files |
| asf | Advanced Systems Format | Video Files |
| ashdisc | Ashampoo Burning Studio Image File | Disk Image Files |
| ashx | ASP.NET Web Handler File | Web Files |
| asi | Alpha Five Variable File | Developer Files |
| asm | Assembly Source Code File | Developer Files |
| asp | Active Server Page File | Web Files |
| aspx | Active Server Page File | Web Files |
| ass | Aegisub Advanced SubStation Alpha Subtitle File | Misc Files |
| AST | Nintendo AST Header | Audio Files |
| asx | Advanced Stream Redirector | Video Files |
| at3 | Airport Tycoon 3 Saved Game | Game Files |
| atn | Adobe Photoshop Action File | Misc Files |
| au3 | AutoIt v3 Script File | Developer Files |
| aup | Audacity Project File | Audio Files |
| avastlic | Avast! License File | Misc Files |
| avd | Avery Database File | Misc Files |
| avery | Avery DesignPro Project File | Misc Files |
| avi | Audio Video Interleave | Video Files |
| avs | Winamp Visualization File | Misc Files |
| awb | Ad-Aware Backup File | Misc Files |
| ax | DirectShow Filter File | Plugin Files |
| axd | ASP.NET Trace Handler File | Web Files |
| azw | Kindle eBook File | Text Files |