Setup Editor ---> Product tab ---> Properties ---> Create a property called WKDIR and in the value type the V:\ or whatever you want your working directory to be. Then move on to the "Tables" tab ---> Shortcut ---> Scroll farthest to the right where you have the WkDir value ---> Type WKDIR there. Voala, we got a custom working directory. ;o)
Hope that helps, and good luck m8.
Regards
Jim