Well yes, but there's a big usability difference between: "Finder used to know how to handle this file but now it doesn't. Please select the application to use

Well yes, but there's a big usability difference between: "Finder used to know how to handle this file but now it doesn't. Please select the application to use for this type of file." and "This requires the Java runtime which isn't installed. Hit this button and we'll download it, install it, and then re-open this for you once it's working."