Board Thread:Questions and Answers/@comment-43411974-20190806144052/@comment-26907577-20190806144515

There would be if Undertale used save.dat files. Do you mean file0?

Regardless, I believe you are looking for the save location. Instructions are available on undertale.com, but on Windows, press Windows key+R to open the Run menu, then type %localappdata% and find the UNDERTALE folder. I hope this helps.