I have eight ranges in total, each of which has it's own text file with all start and end positions listed in adjacent columns like this:

1    1000001
1000001    2000001
2000001    3000001
3000001    4000001

...etc until 155000000 is reached
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I planned to use one range per program, each program would print as many output files as" total number of sites divided by size of the window size." So the 1Mb range would be 155 million / 1million = 155 output files. I'm not quite sure how to obtain the output files needed without sorting the original file