Thread:Project:Support desk/Upload XML files/reply

I answer to myself :

This was because in the function detectScript (in includes/specials/SpecialUpload.php), the system verify the entire uploaded file to find some HTML tags which are ' (First name in French) tag.

To fix the problem I change '<pre' to '<pre&gt;' so that it's only real <pre&gt; tag which cause the problem. Not exhaustive manner of course but it works for this case.