found the error, it's in the included arc.ini
Code:
[External compressor:precomp043]
header = 0
packcmd = precomp043 -intense0 -cn {options} -o$$arcpackedfile$$.tmp $$arcdatafile$$.tmp
unpackcmd = precomp043 -o$$arcdatafile$$.tmp -r $$arcpackedfile$$.tmp
Both need to be changed to just precomp.