Mime-type handling

Hi all, I'm facing a bad behaviour of 'file' command used by fileinfo PECL module (recommanded for mime-type checking): * Some Microsoft Excel documents are detected as Microsoft Word documents * Some HTML files are just text/plain * ... I tested on multiple machines (with different version of file) and I sometimes obtain a diffrent behaviour but never the one expected :/ I also looked for the latest version of file but it seems that the file used to detect the mime-type is out of date... My questions are: * If you already encounter this problem, how did you solve it ? * Where can I find an up-to-date version of magic number list usable with file for mime type checking ? Thanks, Regards, Manuel