Hi Bruce1789,
Many thanks for your question, my name is Tim and I’ll try my best to resolve your issues.
Just a few questions for you to clarify to help my response to you.
Are you using Windows or Mac?
Is Office365 installed?
When you refer to your excel programs do you mean the excel files them selves?
If you’re running windows and office installed, link below to change the default program as Excel:-
https://answers.microsoft.com/en-us/msoffice/forum/all/making-excel-default-spreadsheet-program/9d5369b9-7a98-4017-8e36-3bb411207e49
If you’re running Mac and office installed, link below to change the default program as Excel:-
https://discussions.apple.com/thread/250787017
Look forward to hearing from you.
Many thanks
Tim