This article is relevant if you want to not have Excel open the previous file on startup.
How to Prevent Excel from Opening Last File or Workbook on Mac
Here are the steps that worked perfect for me:
- Go to Terminal
- Change directory to the Saved Application State: (cd ~/Library/Saved\ Application\ State/com.microsoft.Excel.savedState/)
- Remove all files from the directory: (rm *)
- Change directory back one folder: (cd ..)
- Change mode of the folder to read-only: (chmod -w com.microsoft.Excel.savedState/)
That should do it! Excel feels good again.