Help with file permissions

Caporegime
Joined
12 Mar 2004
Posts
29,962
Location
England
So someone accidentally deleted an excel file which had to be restored from a backup and resulted in significant data loss. So I want to deny domain users the ability to delete these excel files, but I'm having real difficulty doing this in windows 10. In windows 7 it was pretty simple, but the Windows 10 interface is terrible in this regard. I deny delete permissions to users and it doesn't seem to do anything?

Please can someone advise me on how to deny the ability to delete or modify files?
 
If you right click onto the file > Properties > Security > Advanced > Make sure you click Disable Inheritance
 
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