[xwiki-users] Content type problem when viewing converted PowerPoint presos

Hi, I'm using XWiki Enterprise 2.1.1 which is fully configured in UTF-8. I noticed that when creating a page from an Office presentation, the resulting page incorrectly displays the accented characters in the french version of the presentation's navigation bar. The main page has a correct content type with a UTF-8 charset but the Iframe displaying the preso (/xwiki/bin/download/SPACE/PAGE/presentation.zip/output.html) has an incorrect charset of ISO-8859-1 even though the content of output.html is in UTF-8. Is this a known issue? Any way to correct it? Mathias.