Open two Excel files at once in external editor?

I love Scrivener, but I find it much easier to edit Excel files in Excel using the “Open in External Editor” function. This works great for editing a single Excel file, but does not work if I want to switch back and forth between two excel files. Scrivener always opens an Excel file under the same name, “content.xlsx” and Excel will not allow opening two files with identical names. Am I missing something? Or am I asking for new functionality, which would assign unique names to Excel files opened through Scrivener, using the Open in External Editor function?