[Typo3] error with pdf "the file don't start with %PDF-"

["David Denicolò aka \"davdenic\""]

Hello, I've a problem, I don't think is a typo3 problem but a server 
problem.
When I open a pdf file via explorer with acrobat 6 I see an error "the 
file don't start with %PDF-".
But if I use firefox or upgrade acrobat to version 7 I don't see any error.
Any Idea?

Please try with http://newwww.pi.infn.it/uploads/media/Lorem.pdf

Thank you
Cheers, D.

-- 
__________________________
Dr. David Denicolò
Chief Designer at InteRa srl
Ravenna - Italy - www.intera.it