Gunzip / .gz file opening

Is there a way of getting DO8 to open unix gunzip files?

I have tried adding .gz to the zip list and associating DO8 with those files but all that happens now is that .gz files are opened in a blank window.

As a long time user of PowerDesk this is the final feature that keeps PD installed on my system. DO8 outshines it in every other respect that I use it for.

Any clues or pointers appreciated...