It happened to me too. My PDF files don't have the PDF icon anymore and when I double click a file, instead of opening right away, I get a list of programs to choose from to open it. This is unacceptable. I thought Avast protects our computers. But this is hijacking. Avast, please clean up your act. How do I get my PDF icons back and don't have to choose from a list of programs to open them?
Gee