Wikimedia Bugzilla is closed!

With $wgUseInstantCommons = true it is possible, that a windows host must save thumbs of files with nonascii letters like german umlauts.

For example: [[File:Amazone_-_Al_Hansen_-_Kölnisches_Stadtmuseum-5054.jpg]]
But the system creates a folder:
thumb\1\1b\Amazone_-_Al_Hansen_-_Kölnisches_Stadtmuseum-5054.jpg
with a thumb file:
437px-Amazone_-_Al_Hansen_-_Kölnisches_Stadtmuseum-5054.jpg

You see, that the german umlauts is broken, which results in a broken image. Changing ö to the correct letter (ö) shows the image, so there is only a problem while saving the thumb to the hard disk, not for showing it.

Trying to upload a file with a german umlauts results in error message 'windows-nonascii-filename'.

Need a idea or a warning for this files, when it is shown or used.