Can somebody explain me step 3 of the GT3 Rip Tourial???

[SimonBradley]

Example of Downsampling

If I had a file called movies.pss that was 48mb and another called
cars.pss that was 4mb.
I would delete the movies.pss file, make a copy of cars.pss and rename it movies.pss.
So the movies.pss should now be a 4mb file but will be a valid movie file.