(double-"r" in referred) They're correct, and mean the same thing, but they're a bit awkward. Unfortunately, I can't come up with good alternatives. This button determines / selects which data file is referred to.
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AvangiThis button determines / selects which data file is referred to.Understand.
AvangiI can't seem to get the idea of "change" into the picture.Change the default is what I meant, but I agree.
Avangibutton" is not idiomatic in referring to keyboards.