I recently installed on my Windows XP box the Collabnet Subversion 1.6.5, including the Apache 2.2 distro that comes together with it.
When I tried to start the http server, I would get an error message:

>>> httpd.exe: Syntax error on line 116 of C:/Program Files/CollabNet Subversion Server/httpd/conf/httpd.conf: Cannot load C:/Program Files/CollabNet Subversion Server/httpd/modules​/mod_dav_svn.so into server: The specified module could not be found.

After quite a while of googling and experimenting I found out that there are 2 (or ate least one) things one should do to make it work.