Best Compression Methods for 'Specific' Games. Q&A

[KaktoR]

This worked for me (change your language in xtool.ini (language inflate only to 103%))

Here are all files which contain lz4 streams

xtool.ini
[Dunia2]
BaseDir=pack\data_final\pc
File1=common.dat
File2=patch.dat
File3=patchshadersobj.dat
File4=shadersobj.dat
File5=worlds\fcbworlds.dat
File6=worlds\fcbworlds_german.dat
File7=worlds\fcbworlds_german_feminine.dat
File8=worlds\installpkg.dat
File9=worlds\installpkg_german.dat
File10=worlds\installpkg_german_feminine.dat

arc.ini
[External compressor:xprecomp]
header    = 0
packcmd   = xtool.exe e:precomp:t100p,c128m:lz4 - - <stdin> <stdout>
unpackcmd = xtool.exe d:precomp:t100p - - <stdin> <stdout>

Maybe you have to use only listed files in xtool.ini in directory (I don't know if it still works if you have other files in pack folder like exe etc) I have only tested with listed files (dat+fat) in their respective folder structure.