More hidden VISTA 'features'...

I want to change the 'file association' for most VFP-related files to open in the running instance of VFP if one is running. That is, if I d-click a file in Explorer I want it to appear in my running VFP and NOT open a new VFP.

I've done this in other OSes but it is well-hidden in VISTA.

Anyone know how?

Thanks