I discovered today that `convert-standard-filename' on Cygwin does
nothing and as result `make-temp-file' fails for name like "*mail*".
The change in `make-auto-save-file-name' in 22.0.50 to call
`make-temp-file' (it was `make-temp-name' before) made `compose-mail'
fails on Cygwin.
I created a new file `cygwin.el' to have Cygwin specific functions
(for now just one). Below is a patch that fix this problem.
Note. Joe, I don't have CVS write permission, so pleas check my patch
and if you find it appropriate, please install it.