I am struggling with next steps for making a CD Disk for my very old Travel Pilot 149 RNS.

I have downloaded the 3 RAR Files. Blaupunkt Teleatlas Great Britain 2005 (RNS) Part 1, 2 & 3.

When I extract them, they all become the same file name, so as they extract they over write the previous file. So I am technically left with part 3 which has a NRG extension.

What are the steps I need to make a disk please?

This was a very hard file to find, and to my knowledge the only one that will work in the system in my car, so any help would be very appreciated.

Thank you