I read this but i could not solve this problem. So can you tell me how to open CBS2010 mdl files.
I have tried lots of time but i could not got the idea about it.

I am totally agreed with you. Notepad has the limitation. It is not suitable for you when you are typing any language syntax. Because it does not make differences between syntax. While you use notpad++, it is the best for use. It provide this type of features so we can use it effectively.