Acrobate 7.0 Default settings

[b.hennessey at att.net]

I have both AA Reader 7.0 and AA Professional on my machine. I installed  the Professional version first and then the Reader. When I double-click to open a document, the default opens the document with the Reader. I want to set the default to open with the Professional version. I do not see this setting in Preferences or in Adobe programs. 

Does anyone have an idea on how to set this default?

Thank you.

Bobbi