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try to use this
fileforums.com/showthread.php?t=99270

to find compression used for this game.

If you find nothing, go with srep+rz(for best compression)

If there are multimedia files in the game, use msc/packjpg/mpzapi according to files + srep + rz
else if it contains compression method supported by ztool, use ztool + srep +rz

Use bigger chunksizes for rz(512mb will be cool, you choice though)