If you are a lazy guy and don't want to mess with your registry, then no worries, you can download the registry fix from the link ahead and run it in your computer to fix this issue: Download the Fix

Now double click on the string and in the filed of value, type Microsoft Excel Previewer and click OK.Now in the right side panel, delete the string.After opening the registry editor, navigate to the location ' HKEY_LOCAL_MACHINE\​SOFTWARE\​Microsoft\​Office\​ClickToRun\​REGISTRY\​MACHINE\​Software\​Microsoft\​Windows\​CurrentVersion\​PreviewHandlers'.In the run box, type regedit and click OK.Open RUN by pressing windows and R keys together.Well, to fix this issue, you can use a small registry tweak which I'm gonna share here. Online and quick repair also didn't fix this issue.

Uninstalling and reinstalling office didn't fix this issue.

Office 365 users have reported that after upgrading to office 2016, they are getting this error while handling with the excel attachments in outlook. This file cannot be previewed because there is no previewer installed for it : This is one of the most common issues which Outlook 2016 users are facing.