Thread:Project:Support desk/Uploading pptx files

PHP 5.2 MW 1.15.4 / 1.16

I am trying to upload pptx files. I read how to configure my wiki to do so ($wgFileExtensions, etc ..) but I still have this message : "the file is corrupt or has an incorrect extension". I saw in MimeMagic.php and in the debug log file how it works and it seems that the regular expression is not able to find which kind of mime type my pptx file is. So the function detectZipType always returns 'application/zip'. I tried with a 1.16 version and it is the same (not same message but same reason). What can I do knowing that I don't want to disable the mime type detection for security reasons ?

Thank you in advance and have a nice day.