PDF's/Safari Browser

For some reason, when I click on a PDF document whilst browsing the Internet in Safari browser, the following box now pops up and asks me to select a reader:



This never used to happen - it used to just open in Safari browser, but now in the list of applications, I don't have the option to choose Safari anymore as it is greyed out.

Any ideas how I can sort this out?

I would run MainMenu's script that fixes the LaunchServices database. Looks like the system has lost the connection with the type of file and what is supposed to open it.

Could be something else but for now, that is what I would try first.

How do I do that mate?

Liam