nah, makes no difference no matter what i do, lol... tried US and PAL versions, compressed and uncompressed. i have NEVER gotten this game to work in OPL, no idea why. i have hundreds of games on my internal HDD, all work great except this one. maybe i should file a bug report, haha? no big...
Half-Life works for me uncompressed, have not tested ZSO yet but i'm assuming it will work fine. i use PFS BatchKit Manager to inject my games, and it does the conversion to 2048 byte automatically using bchunk. try using one of them?
if you are using internal HDD, make sure you turn on mode 1...