I'm having the same issue. ALL of my patches from who knows when have been set to Max 5 Runtime as the default application. I can of course set them individually but other apps allow for setting the default app for all files in one swoop by clicking "change all" under the "Use this application to open all files like this one". When getting info on a max 5 file the "change all" option is grayed out. Anyway, this isn't the end of the world but it would be great to reset all of the patches at once.