I THINK IT ILLEAGL BUT I DID IT REEEEEEEEEEEEEEEEEEEEEEEEEEE
lol i figured it would be possible bc etterna is stepmania only with a community that cares about the game
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Etterna uses .sm, .dwi, .scc formats that SM5 does. The vast majority of packs were created before Etterna even existed, and were intended to be played on (probably) SM 3.9.