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I don't know. Do you have a 64-bit system? Try setting compatibility parameters when launching the game. The utilities are definitely 32-bit.
Hmm... I didn't think about the bitness... Thanks. I'll try it.
Yes. Win7 64-bit... The problem was solved by not launching orc2zip and zip2orc, but simply dragging the Data.* files onto these executables in the file explorer...