You can convert the MPEG-4 file into a different format.
Here is a Google search for MPEG4 to AVI:
That turns up many programs that can do that.
Pick one that sounds right for you.
Can you please tell me how to burn video files taken with Sony DSC T 500 camera onto a CD/ DVD. The Nero software ( version 6 ) that I have does not recognise these files which are probably MPEG 4.I am using laptop with windows XP & pentium 3 processor.