Mtc2Graph : ModeleInteracteur IHM file is detected as an include and is not correctly handled

The regex used to see if a file is included is a little too wide and catches the .mtc file I use as an IHM for ModeleInteracteur.

Agreed, I should probably use a .txt extension (but I would not have the filetype highlights in my editor), but we should probably try to find a way to make the regex narrower.