Monodevelop not opening

When I double click a script monodevelop isn't opening, but I can open monodevelop separately and then load projectname.sln file and it syncs ok. I can also call external editor, but I'd like to use monodevelop for code completion. Anyone managed to get this working? I have mono-4.0.3-gtksharp-2.12.26-win32-0.msi and gtk-sharp-2.12.26.msi installed, and I am using Windows 7.

Solution

Maybe, Monodevelop is not associated with Unity. Go under Edit -> Preferences -> External Tools and see if Monodevelop is selected as external script editor.