Well, you haven't searched this forum well enough since I've posted a sort of explanation for Opcode errors in a couple of threads before. Here goes:
"An "opcode" error most often means the emu is running wild (due to whatever error), and tries to interprete some random memory as code.
The reason for this can be everything. Best way is to reduce everthing to minimum, that means: only use a software gpu, the internal epsxe SPU, and the epsxe internal cdrom/ISO emulation. "
As for the games, I've extracted a couple of games like that and they work fine. Are you sure they are PSX games to begin with?