xdm Xauthority and mount -o managed authfiles

[pbs]

xmd creates an Xauthority file in the dir /etc/X11/xdm/authdir/authfiles 
which by default has a colon ":" in the name. MSwindows does not support 
":" in names and this causes an error in xdm.  As a work around if the 
authfiles dir is mounted as a managed mount
mount -o managed c:/cygwin/etc/X11/xdm/authdir/authfiles \
	/etc/X11/xdm/authdir/authfiles
Then the file is created without an error.

Perhapse some one would like to verify this, and if it is correct, I 
think it would be a good idea to add this to the FAQ:
http://xfree86.cygwin.com/docs/faq