A3 file extension is for Unrelated Inventions Audiotools Show Log
Similar to A3
668 - Music the mixing is always at 12048Hz669 - 669 Composer 8-channel MOD Music File
6CM - 6 Channel Module Music
75 - Ventura Publisher 75x75 dots per inch display font file
777 - Compressed file archiver 777
7z - 7-Zip format LZW compressed file
8 - Assembly language source code file A86
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