investigating the file "SAVE.DAT" with surprise i see that there are 3 files zlib inside ZLIB.0 .....,so my idea is decrypt full the save with quickbms and look the offsets and make the break up of the three files separately and resign this with tool zlib.
After this procedure .... add the header ZLIB.0
maybe something can be done ........... i hope the developers view this topic for solve this issue
look this pictures
.i (78 01 in hex editor) is a normal compress zlib
here my original personal savegame ZLIB for your testing :
http://www.sendspace.com/file/bxe7ge