A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
I also have this problem on all 3 of my computers. All are running Win10 with Excel 2016 through an Office 365 subscription.
Creating a copy of the Excel executable, naming it Excel2 and then setting it as the default program to open Excel files solves the problem.
Not a great workaround as every time Excel updates through my subscription I have to go make a new copy, set the default, blah blah blah.
Please submit this bug and have it resolved!