MCM Compressor :p

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[External compressor:mcm]
packcmd = mcm -x9 $$arcdatafile$$.tmp $$arcpackedfile$$.tmp
unpackcmd = mcm d $$arcpackedfile$$.tmp $$arcdatafile$$.tmp

-x command is not using for decompress, use d command. it is decompressing well at me.x command is for freearc to decompress not mcm

Usage: mcm.exe [command] [options] <infile> <outfile>
Options: d for decompress
-{t|f|m|h|x}{1 .. 11} compression option
t is turbo, f is fast, m is mid, h is high, x is max (default mid)
0 .. 11 specifies memory with 32mb .. 5gb per thread (default 6)
10 and 11 are only supported on 64 bits
-test tests the file after compression is done

H:\Games\NieR - Automata>mcm -x ./ ../data.biyori must be H:\Games\NieR - Automata>mcm d ./ ../data.biyori

example is in the decompress.bat. you can just run to extract that data.bin