Extension Description Author File / Link
amm Audio Manager Module 3.x Technomaestro/RDG Download
ams Extreme's Tracker AMS Format v1.3 Download
Velvet Studio AMS Format v2.2 Patrik Oscarsson Download
an8 Format of Anim8or .an8 Files - V0.85 Download
analyze Mayo Analyze format Deprecated resource Link
ani Windows 95 Animated Cursor Format R. James Houghtaling Download
anim IFF format for CEL animations Sparta Inc. Download
Deluxe Paint Anim Files Download
ans ANSI Escape Codes Download
apc Cryo Interactive APC Audio File Formats (.APC, .HNM, .BF, .ZIK) Valery V. Anisimovsky Download
apk ZIP-based installable package format for Android applications Google Link
arc ARC/PAK File Format Max Maischein Deprecated resource Download
arj ARJ File Format Robert Jung Deprecated resource Download
ark Ultima Underworld (and II) unofficial specs Jim Cameron Link
arrow Columnar binary file format storing Arrow record batches (also used with .feather) Apache Software Foundation Link
arw Sony's TIFF-based raw image format for Alpha and related cameras Sony Link
as Applixware Spreadsheet file format (.as) VistaSource, Inc. Download
asc Text encoding of OpenPGP signatures, keys, and encrypted messages IETF OpenPGP Working Group Link
Plain text restricted to the ASCII character set IETF / ANSI Link
asf Windows ASF format Art Yerkes Download
Advanced Streaming Format (ASF) Specification (Draft) Eric Fleischman Download
Electronic Arts Audio File Formats (.ASF, .AS4, .KSF, .EAS, .SPH, .BNK, .CRD, .TGV) Valery V. Anisimovsky Download
Advanced Streaming Format Microsoft Deprecated resource Link
atari Atari ST executables TOS, PRG, TTP, PRX, GTP, APP, ACC, ACX Daniel Fischer Download
ST Graphics Formats: NEO, ANI, PI?, PC?, TN?, SPU, SPC, ART, MUR, DOO, FLM, IMG, PAC, IC?, IFF, MAC David Baggett Download
au Sound format used by Sun and NeXT machines Marshall Rose Download
aud Westwood Studios AUD Audio File Formats (.AUD, .TLK, .PAK, .VQA) Addendum Valery V. Anisimovsky Download
AUD file format used in Command & Conquer and Redalert Vladan Bato Download
avi Microsoft Audio Video Interleave file format documentation describing the RIFF-based AVI container, headers, streams, and index; 1996 reference Microsoft Corporation Download
Practitioner-oriented FAQ covering AVI structure, codecs, players, and common interoperability problems John F. McGowan Link
OpenDML extensions to the AVI file format addressing the old AVI 1.0 size limits by chaining AVIX RIFF chunks and adding standard index chunks; version 1.02, 1996/1997 OpenDML AVI M-JPEG File Format Committee (Matrox Electronic Systems Ltd.) Link
avif HEIF-based still/animated image format using AV1 intra-frame coding Alliance for Open Media Link
avr AVR (Audio Visual Research) sound format Download
avro Schema-based binary data serialization and container file format Apache Software Foundation Link
aw Applixware Words file format (.aw) VistaSource, Inc. Download
aws AWSTAPE virtual tape drive Utilities and information Link
axs AXS realtime analog synthesizer file format Shawn Harrison Download
azw3 Amazon Kindle e-book format with HTML5 and CSS3 support, built on the MOBI container Amazon Link