bug#13907: 24.3.50; cygw32 build mishandles drag-n-dropped file with non-ASCII characters in name

[Eli Zaretskii]

> Date: Fri, 08 Mar 2013 12:18:05 -0500
> From: Ken Brown <kbrown@cornell.edu>
> 
> Create a file "/tmp/Ü.txt".  (In case my mailer mangles this, that's 
> <U-umlaut>.txt.)  Now open Windows Explorer and drag this file into an 
> emacs frame.  This results in the error message
> 
>    dnd-open-local-file: Can not read file:///tmp/%20.txt
> 
> I think the problem occurs early in w32-handle-dropped-file (defined in 
> lisp/term/w32-win.el).  That function starts with
> 
> (let ((f (if (eq system-type 'cygwin)
>            (cygwin-convert-file-name-from-windows file-name t)
> 
> At this point f should have the value "/tmp/Ü.txt".  If I continue 
> manually carrying out the code in w32-handle-dropped-file as though f 
> had that value, everything is fine, as shown below.  So 
> cygwin-convert-file-name-from-windows must be doing something wrong.

What do you get from cygwin-convert-file-name-from-windows with this
file name?

Also, what is the system codepage on this system?