Profile stats and stuff are stored in %APPDATA%/StepMania 5.0/, not the stepmania folder, so you don't have to worry about losing those.
(you can also put songs and themes in the folders inside that folder instead of the main stepmania folder)
< cybik> til Kyzentun fixes bugs for breakfast
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< maxvg1> shakesoda: then why do i still play lol
<@shakesoda> because you're an ITG player. And thus, a masochist
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<@shakesoda> Kyzentun: I think you might need to put down the meshes for a bit