Exchange 2007

hi everyone
how do i block incoming e-mail massages that comes with specific type files like .exe .jpg .mpg etc... attach to them
(from outside the company)
thank to all the helpers

Look for MIME filtering of some sort. I am not an Exchange expert and haven't ever touch an exchange box but MIME is usually a core component/option of any mail filtering system. just make sure it is up to date, the new style of Microsoft Office extensions actually work as archives filled with xml's and MIME will flag them.
Hope this helps.