On my sytem there is XPP, Acrobat 5, Reader 9 and IE7. When I click a PDF file located somewhere on my computer it opens - as desired - in Reader 9. However, if I click a link in IE7 to open a PDF file online, it opens in Acrobat 5. But in most cases I get an error, because Acrobat 5 can not open PDFs created with new versions.
For compatibility reasons I have to keep the Acrobat 5
How can I "convince" IE7 / XPP to open PDFs online with Reader as well
Thanks for an hint
That's easy uninstall Acrobat and re-install Reader.
There are widely known issues with having Reader and Acrobat on the same Windows system. Adobe recommends you only have one, due to the issues having both cause.