Parallel system

[GOODSYSTEMS]

I have used gnucash for some time, very happily. Now, I am trying to load a 
second copy to a different O/S on the same computer, and use existing data from 
the first install. This would be a great convenience, as it would allow simple 
access without having to reboot (I do development work, and having both O/S's is 
a necessity for testing).

My older gnucash install is v2.0*, running on Windows XP. The newer install is 
v2.4.8, running on Vista. Both O/S's are up to date.

I was able to install v2.4.8 successfully on the Vista side, but I cannot figure 
out where to point to connect to the existing data. Can you tell me the nominal 
path of the older (XP) data, and/or the appropriate file name, and/or the setup 
file that contains a path pointer for the data? Or, if it isn't possible, just 
that it isn't possible?

Thanks.

jhc