I use zipware, which hasnt had any issues before now, with this game or any others, in fact the copy that doesnt have the guide and cheats for v0.73.1 extracted with no difficulties. The option to extract it with zipware doesnt even show up on the copy with the guide
Gave that a try and it seems to berhave properly now, but in doing so I noticed that the copy without the guide uses .zip instead of .rar, could that be affecting it?