Installing GTK libraries

I'm trying to create an install program to install my program along with
the GTK libraries.  I've got the files in c:\gtk and I need to add the lib
and bin directories to the path.  Is this right?  Is there any other way
for windows to find the libraries?  Can I just lump all the lib & bin stuff
into the c:\gtk directory and then put my app in c:\gtk?

I see that the Gimp has put the gtk 1.3 stuff in a directory called c:
\gtk1.3 and the Gimp execs are eslewhere.  I also saw a registry key setup
that points to the directory.  Does this work for gtk+ 2.0?  If so, how do
I setup the right keys?  Also, will this work on all versions of windows?
How does the Gimp find the gtk libraries?

Thanks for any help
Bill