Postgresql 7.4 on cygwin, upper() does not work with german special characters (umlaut)

[sebastian grunow <sebastian(dot)grunow(at)web(dot)de>]

Hi all,

we are running postgresql 7.4 under cygwin (the package delivered with 
cygwin)
under german Windows XP Professional SP1 an we experience the following 
problem:

- first off all we are not able to enter german special characters such 
as ÄÖÜ in
 the cygwin shell, but we are able to enter them in an editor (eg. vi). 
That should not
 be too bad...
- when we perform a "select upper('ÄäÖöÜüAaOoUu');" we get the following 
result:

    upper
---------------
ÄäÖöÜüßAAOOUU
(1 row)

The special characters are not converted to capital letters! If we run 
the same query against postgresql 7.4 on a linux-platform the special 
characters are correctly returned in capital letters.
Any suggestions or solutions are welcome!

Kind regards
Sebastian