Where does gnucash record the location of my files?

[Paul Abrahams]

As I mentioned in an earlier post, I'm running gnucash under Kubuntu Oneiric 
11.10, and I had a problem with gnucash segfaulting before it could get going.  
So I tried renaming both .gnucash and the data directory so that gnucash 
wouldn't see them.  This time gnucash did get started, but it complained about 
a missing file anyway, and it knew where the data directory was supposed to be.  
So there must be some other place where that information is located.  Where 
might that be?