Error opening WP & Docs after Adobe update

Hi all,

I am using P6 (v 7.0) and have links to pdf drawings / specs (stored in shared drive) under WP & Docs. I was able to launch all drawings till recently but soon after an Adobe update I get error message saying P6 is unable to find the program that opens it.

I can still open the drawings as normal outside of P6 but when I try launching it from P6 I keep getting the error message. Can I somehow assign the default program for P6 to open pdf drawings? ...something like "open with"... Any pointers would be appreciated.

Thanks in advance.