emacs and cygwin: directory mappings eg for Info-default

[leo]

hi there

how can i make emacs and cygwin play nicely together?

i have installed emacs 21.3 in c:/free/emacs-21.3 and cygwin in c:/cygwin.
the Info-default-directory-list variable then contains:

("c:/free/emacs-21.3/site-info/"  "c:/emacs/info/" "/usr/local/info/"
"/usr/local/share/info/" "/usr/local/gnu/info/" "/usr/local/gnu/lib/info/"
"/usr/local/gnu/lib/emacs/info/" "/usr/local/emacs/info/"
"/usr/local/lib/info/" "/usr/local/lib/emacs/info/"
"c:/free/emacs-21.3/info/")

that's nearly right: all the paths without a drive letter just should be
understood  as cygwin paths. is there a way to make emacs understand that
"/usr/local/..." in fact is under "c:/cygwin/usr/local/..."?

a quick fix obviously could be to modify the list directly, but a more
general approach would hopefully work file-find, etc as well.

thanks, leo