>The old code just did RUN PKUNZIP MyZip.ZIP. We tried just leaving this in, but ran into memory problems.

Hey I ran into that long ago and far away. I believe I either searched out a PIF for PKZIP stuff and set it to run in separate memory space, or I created my own dummy PIF and got it to work. Somehow though I got past the memory problems, I might of even had to resort to creating a shortcut on desktop and setting "running in separate memory space" thru properties, wish I could remember exactly but I switched jobs since then. HTH