[eluser]franboud[/eluser]
Thanks to localjoost!
Here's my solution, that works with Firefox, IE8, Safari, Opera and Chrome :
In the mimes.php, add this line :
Code:
'flv' => array('', 'video/flv', 'video/x-flv', 'flv-application/octet-stream', 'application/octet-stream')