Going back to Scrivener 1

I’ve gone back to Scrivener 1 because the auto-correct is so much better than Scrivener 3. Scrivener 1 has a problem with substitutions, however, that I suspect is in the file used to store the substitutions. (I re-installed Scrivener 1, so it’s not the program.) Can somebody tell me the name of the file and where is it located?

Note that the two project formats are incompatible. You might want to keep Scrivener 3 around for back-conversions of Scrivener 3 projects if needed.