G_FILENAME_ENCODING broken in GTK 2.24.17?

[Manuel Reimer <Manuel Spam nurfuerspam de>]

Hello,

I use a system which uses ISO-8859-1 encoding for paths and filenames.

If I use Firefox and try to open a file with, for example, german "Umlauts" in 
the filename, directly in an external application, then Firefox saves the file 
correctly to /tmp but passes the path to the external application as 
UTF-8-String (which, of course, can't work).

If I manually open the file into LibreOffice, then it opens, but I'm unable to 
print it out as Libreoffice passes a broken path to "lpr"...

How to fix this?

Thanks in advance

Yours

Manuel