| .atf |
Axon Text File |
| .adpp |
Adobe Device Profile Package |
| .appup |
Erlang Application Upgrade File |
| .aml |
ACPI Machine Language File |
| .arff |
Attribute-Relation File Format |
| .an |
Adobe Edge Animate Project File |
| .appcache |
HTML5 Cache Manifest File |
| .aidl |
Android Interface Definition Language File |
| .adoc |
AsciiDoc File |
| .all |
Java RMI Policy File |
| .adif |
Amateur Data Interchange Format |
| .aut |
AutoIt Script File |
| .arena |
Quake 3 Engine Arena File |
| .actx |
DS Game Maker Action Description File |
| .accdw |
Microsoft Access Database Link File |
| .asb |
Alphacam Stone VB Macro File |
| .adml |
Group Policy Language-Specific Administrative Template |
| .am |
Automake Makefile Template |
| .a8s |
Anim8or Script |
| .awcav |
ActiveWorlds Custom Avatar File |
| .avj |
AntiVir Job File |
| .arscript |
ArtRage Script |
| .ash |
Nintendo Wii System Menu File |
| .ascs |
ActionScript Communication Server File |