| .3gp |
3GPP Multimedia File |
| .1st |
Readme File |
| ._docx |
Renamed Microsoft Word Open XML Document |
| ._doc |
Renamed Microsoft Word Document |
| .602 |
Text602 Document |
| .abw |
AbiWord Document |
| .asc |
PGP ASCII Armored File |
| .ase |
Adobe Swatch Exchange File |
| .ans |
ANSI Text File |
| .act |
ADPCM Compressed Audio File |
| .aim |
AIMMS ASCII Model File |
| .aww |
Ability Write Document |
| .adoc |
AsciiDoc File |
| .aty |
Association Type Placeholder |
| .awt |
AbiWord Template |
| .awp |
Ability Write Template |
| .apt |
Almost Plain Text File |
| .apkg |
Exported Anki Flashcard Deck |
| .ascii |
ASCII Text File |
| .bib |
Bibliography Document |
| .boc |
EasyWord Big Document |
| .bean |
Bean Rich Text Document |
| .bml |
Bean Markup Language File |
| .bdr |
Publisher Borders File |