I'm not sure I understand you right, but in MC you can define different applications for viewing, launching and editing. I.e. you may view (F3) *.txt with AkelPad, edit (F4) with PSPad and launch (Enter, Doubleclick) with default windows app.
Or do you mean TC-like behaviour where launch (Enter, Doubleclick) can show pop-up menu with multiple open-with entries?