Accessing Bookmarks...

I'm trying to access a list of Firefox bookmarks via XPCOM from a Win32 
program . . .

I've written a Win32 program to try and get the Firefox bookmarks via the 
"rdf-service".  (I had to move over some .IDL's from the mozilla source tree 
and turn them into .H's).  I can get the rdf-service instantiated, but I 
can't create a data source for "rdf:bookmarks" (fails with an error 
0x80040154).  I can create a data source for "rdf:files", so I think I'm 
instantiating the rdf-service correctly.  And I can access the Firefox 
cookies from my program, so I'm pretty far along the XPCOM learning curve . 
. .

Questions:

1)  I assume that the reason I can't instantiate a data source for 
"rdf:bookmarks", is because there isn't code to support this functionality 
in the GRE.  Is there another "runtime" I should be using instead of the 
GRE?  Is possible to "install" the proper components into the GRE?

2)  Is this the best way to get at the bookmarks -- Any other ideas on how I 
can get at the bookmarks from outside of Firefox?

Larry