Hi all François wrote: .... This is a PHP issue - mime_content_type seems to be buggy under windows. Possible solutions: 1) See http://www.php.net/manual/en/function.mime-content-type.php, about half way down the page: The function mime_content_type only worked for me on Microsoft Windows after I added the directive "mime_magic.debug" to my php.ini with the value of "On". The default value appears to be "Off". Exampe: [mime_magic] mime_magic.debug = On mime_magic.magicfile = "c:\php\extras\magic.mime" 2) Install PHP with the fileinfo extension enabled (see http://pecl.php.net/package/fileinfo). MediaWiki will use it instead of mime_content_type, if it's available. Note that this probably also uses a mime.magic file somewhere, somehow... If (and only if!) you install fileinfo as a shared library, also set $wgLoadFileinfoExtension= true; in LocalSettings.php. 3) Use an external program for mime detection by setting $wgMimeDetectorCommand (in LocalSettings.php) to a command that will return the mime type of a file. Under linux, "file -bi" works fine, but that is not available under windows without a little fiddling. You might get it to work via cygwin. I hope this helps - please give feedback which solution works for you, so other people running 1.5 under windows have an idea how to solve this problem. Thanks for giving feedback! -- Duesentrieb