zugelassene Dateiformate:

'png','jpg','jpeg','gif','zip','pdf','tif','tiff','bmp','eps','psd','ai','cdr','doc','docx','xls','xlsx','ttf','raw','pfb',

'cal','cgm','cmx','cpt','cur','dwg','dxf','emf','fmv','fpx','gem','ico','img','jp2','mac','pct','plt','pps','ppf',

'rtf','sct','svg','svgz','tga','txt','wmf','wp4','wp5','wpd','wpg','wsd','wi','xpm'