Ok Tom.
I did that way and now I am getting assembler keywords coloured.
In spite of that, I couldn't work out adding the character as ' ;' in keyword field. I figured out the reason for.
Perhaps, could it be existing a way to modify default 'C-like' configuration: just for getting it the same way my customized/assembler comment-like. Could not it?
In fact the C/C++ source is recognized properly.
--Angelo