Setting Default Spreadsheet Program

[Cloverjo]

I have a newish laptop, and am trying to view Excel sheets sent by email. I don't have Excel, but do have OpenOffice Calc, which I believe can be used to view Excel sheets. My lappy is trying to open them with MS Office, which I don't have, don't want and which it keeps exhorting me to try or buy. Can anyone tell me how to make Calc my default for viewing spreadsheets.
Windows 10.
Thank you.

[Bertrum]

The official way to do it
https://www.cnet.com/uk/how-to/how-to-set-default-programs-in-windows-10/
or
Save the file to disk
Right click and select “Open With”
Click on “More Apps” also check “Always use this app to open ......”
Select your chosen program
If not in the list
You may have to click “Look for another app on this pc”
But that does require some knowledge of where the program is

[SlackAlice]

In the search box type settings,then choose Settings/Apps/Default Apps then scroll down to and click 'Choose default apps by file type'

[Cloverjo]

Thanks to you both.