Windows XP can create a Résumé.html file but ruby cannot

Windows XP can create a Résumé.html file but ruby cannot. Why?

The following code created the wrong filename
File.open(“Résumé.html”,“w”) { |file| file.write(‘xxx’); }

Also, this code does not work
str = “Résumé.html”
filename = Iconv.conv(‘UTF-16’,‘UTF-8’,str)
File.open(filename,“w”) { |file| file.write(‘xxx’); }

If I manually rename the file to Résumé.html, it does work.

Setting the $KCODE=“u” or $KCODE=“UTF8” makes no difference.

Whats wrong with ruby v1.8.7 (or is it me)?