installing tracks the manual way?

I downloaded SS Dolmen, but it was not in RX Content format (drag and drop) plugin.

I have a list of track-755_M with other letters. There is no readme, but other txt files to replace. How on earth do I do it this way?

There is tracks.txt and tracksetting.txt

I don't get WHY there's no readme.

Does this replace in game tracks, or in a seperate menu etc?