| 3k | APP Keyboard Definition Data |
| 5xb | Line 6 POD HD500X Edit Bundle |
| 5xe | Line 6 POD HD500X Edit Preset |
| 8st | 8start Launcher File |
| a3x | AccuLoad III-X Configuration |
| aaw | Lavasoft Ad-Aware 2007 Configuration |
| acbl | Adobe Illustrator Legacy Color Book |
| access | Java Access Control Data |
| acf | DB/TextWorks Access Control File |
| acg | IBM Personal Communications SNA Configuration |
| acn | AceNet Configuration |
| acrobatsecuritysettings | Adobe Acrobat Security Settings |
| acs | DB/TextWorks Access Control Special File |
| acw | Accessibility Wizard Settings |
| adba | AIMSS Author Project Configuration |
| adml | Windows Group Policy Language-dependent File |
| admx | Windows Group Policy Language-neutral File |
| adpp | Adobe Device Profile Package |
| adv | Ableton Live Device Preset |
| aiis | Telerik Test Studio Project Settings |
| aiu | Advanced Installer Updates Configuration |
| aiw | FDS Imaging Software Configuration |
| akm | Aksharamala Binary Keymap |
| aliases | LabVIEW IP Adresses Map |
| amp | PATCHMASTER Amplifier Settings |
| antispam5 | Personal AntiSpam Settings |
| aois | CFS Console Add-on Installer Settings |
| aom | After Effects Output Module |
| appref-ms | Microsoft ClickOnce Application Reference |
| apv | BenMAP APV Configuration |
