Windows 10 (up to date) and Excel 2013...
In Onedrive I open the file I want to share. I click on File, then Share. Share a link has a choice of View Link and Edit Link.
If I choose View Link (NOT Edit Link) it gives me a link like "https://1drv.ms/x/s!AkTXZs72goWAsjnqeNTsWKoGeIN".
If I send that link to a friend he can click on the link and my file opens.
But he can edit the file even though it was supposed to be View Only.
How do I make the file View Only?