Hi Markus
This is an issue that has been seen quite a bit in the web
world. If you were to Google the issue, you would also see it
exists for Microsoft Word too. Again, it's not something one may
configure easily. I do believe it stems from the File association
in Windows.
Yes, you may configure your Acrobat Reader so links to PDFs
from web pages open in the stand alone reader. But that's only
changing behavior for you. Not for others. How the PDF displays for
others is defined individually on their own PCs. My thoughts are
that if we could influence this behavior, what would stop a hacker
from influencing malicious behavior? And there, I believe, is the
rub.
Cheers... Rick