Yes, it will generate a downloadable file.
But the encoding of the file is always utf-8.
I created a fiddle here: http://jsfiddle.net/3vqr1djt/
When I open the file using windows-1252 Encoding (open with Excel, as it will ignore that the file is utf-8), it will display: ü ä ö
When i open the file with Notepad, it detects that the file is utf-8 and will display using utf-8 encoding: ü;ä;ö
So the file download is working, but the charset is ignored and utf-8 is always used.