Win7prosp1, when trying to open a pdf from an email (double click), I get this message, This file does not have a program associated with it for performing this action. Please install a program or, if one is already installed, create an association in the Default Programs control panel. If I right click on the file and choose open with, it opens fine in adobe. The association is correct under associate a file type. What I have found is that when Firefox was updated, this issue started to happen. I had created a new user on the machine and was able to open the pdf by double clicking. I then opened Firefox for the first time and tried the open again with the result described above. It broke it. I then removed Firefox, restarted, opened and email with a pdf and it worked fine. Anyone experience this same issue? What in firefox is causing this to happen?