When a file is opening with a different app than the one you want, or you receive an error that "There is no application associated with the file...", you'll want to associate the type of file with the desired app.
Associating PDF, CSV, and other file types with an app
This method is great for letting Windows know which app to use when needing to change the file association for one file type.
Changing the default browser to use when clicking hyperlinks
This method is suggested for changing the default browser to Google Chrome without setting Google Chrome as the default PDF viewer, which is blocked by Right Networks for security concerns.