Acrobat 7.1 IE plugin cannot open .pdf Files with mt/application/octet-stream

Hi Folks,
we have some problems to open pdf - files via Hyperlink in an IE Explorer. this files get from the web-server the MIME-Type "octet-stream".
the only option is to save and then open the pdf files. But we want to open the pdf files directly IN the IE. the option to open it not in IE is not possible because then another application will not work.
Is it generally possible to open an pdf File with an octet-stream MIME-Type with the IE-Pluin, and if Yes is ther any possible configuration we could try.
Thanks for your help
regards
Felix

Hi Bill,
we already tried to change that checkbox that solves the problem but we get new problems with other applications, so this way is also no option for us.
also we tried to repair / reinstall acrobat, but it has no effect.
I suppose that maybe adobe just closed that door to open pdf documents with the octet-stream MIME-Type. Because it could an way to insert executable files in the system.
maybe a higher version than 7.1 can do this?
Thanks for your help, here in Germany it is already 2 pm so not far from quitting-time ;)

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