Are you frequently using a file type with more than one application but able to associate only one application with the file type? OpenExpert is the answer. Instead of messing around with a file type that has a fixed association to only one application, you get an Open With item added to the context menu of the specified file type for all the applications you decide.
Version 1.3 lets you add applications more quickly to OpenExpert's menu; icons are displayed more properly now; you can display the "Last used" application separately in Explore's contextmenu; and more. OpenExpert is multilingual and supports English, German, and Spanish.