When i try to open whichever file it is with NotePad++ it gives me an error but if i try with the Standard Notepad it open fine
I have had this problem before
The problem is your notepad ++
My Notepad++ work's fine and is very useful.
I even upgraded but still
EDIT:The only way it is fixed is if i open it and resave it
Doesn't sound like a MyBB problem then. If you're still having problems, please try another editor like Crimson Editor, EditPad, etc.