Problem with modification dates

[Tim]

Hi,

I have two identical stacks on two machines, a Mac OS X and a Win2K. I want
to have a third stack be able to look up the modification date of both
stacks and open the most recently modified stack. The problem is that when I
open the stack which resides on a Mac with PC Revolution and modify it  and
save it, the modification date does not change on a Mac. This is very weird
stuff indeed. Does anyone have a solution?

TIA,

Tim