Monodevelop STILL won't open in Unity 4.5.2 (OSX)

The error message says: Unrecognised file format.

I’m just trying to open code. Another question on here suggested if I updated to the newest version that would fix it, but it hasn’t!

Monodevelop and osx just don’t seem to mix i have osx 10.8.5 and it wont work either and on the monodevelop website it lists a bunch of bugs.