How to disable File Transfers in MSN 7/7.5

Hi Guys,

Well, I've searched for days on end trying to figure this one out!

Please, can ANYONE tell me a reliable way to stop files being sent or
received? Ideally with a restriction based on file extension, but I'm
happier to have all disabled than none!

Thanks very much!
Simon.

PS to Microsoft, please put this in MSN 8 guys! You know you want to
It'd make my day!