I mean only English characters when you open any other files except pdf. So German and French characters aren't supported. If you use Calibre to convert all your books to PDF there will be no issues , that's what I do for my German books. There were several other ebook readers I found that did have multilingual support.
They made now a flexible screen version of my current reader :
http://translate.google.com/translat....com/ebook/C61