How do make Cmd + S files save to the file I opened with numbers with its existing format/extension?

I usually open .XLSX files with Numbers for quick edit.

However doing Cmd + S makes Numbers prompt to save the file with .numbers extension. How do I override this behavior?


Numbers does not open Excel files directly. A new Numbers document is created.

  • Numbers can convert Excel files to Numbers documents when opened, which is a lossy process, and
  • Numbers can export to Excel, which is a lossy process.

Since both steps are lossy, it’s required to be explicit.