Unable to open word attachment after Win 10 upgrade

Since upgrading to Windows 10, I am unable to open Word attachments. I get an error.

No matter which option I Select, this always happens.

Running eM Client

If I save the attachment first and then open it, it works fine.
I have run a repair of em client and word but still get the error.

I can open pdf files fine.

Hello, can you please check if you have .NET 3.5. enabled on your windows installation? .NET 3 is a part of the installation but may be disabled, navigate to Control Panel > Programs and Features > Enable windows features and make sure .NET 3.5 is checked. Restart your computer after enabling and check if the issue persists.