Applies to:
Windows Server 1709
Windows 10 1709
Windows 10 1703
Windows Server 2016
Windows 10 1607
Ismael Limbada, Microsoft France CSS Support Escalation Engineer has a nice blog post of the most common issues and best practices when creating “File Associations” in Windows 10.
Windows 10 – How to configure file associations for IT Pros?
https://blogs.technet.microsoft.com/windowsinternals/2017/10/25/windows-10-how-to-configure-file-associations-for-it-pros/
Yong