OpenEuphoria

This functionality has been removed since Vista- the built-in file association editor is a dumbed down crippleware version of the one in XP.

To edit advanced options, you now need a 3rd-party tool. Types is open-source, and replicates most of the functionality that was previously present in XP, such as the ability to pass command-line arguments to an EXE, which you need to run an interpreted program.

http://types.sourceforge.net/