Filter of unsupported files
Choosing folders as base for media, some unsupported files either produce messages like "Für diese Datei konnte kein Typ ermittelt werden." (For this file no media type could be determined) - which is not wrong but misleading as the file-extension / suffix is determined very well, or files like i.e. *.psd destroy the layout and are rendered as black rectangles.
A nice feature would be just to filter those unsupported files.
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