If EML files are not previewing correctly in Windows File Explorer's preview pane, it is because Outlook has failed to register itself as a preview handler for EMLs. You just need to add a registry setting. You may need to get your IT to do this for you and they may have a preferred way to deploy Registry changes to staff, but we have provide a link to a REG file which you can use to update the registry:


  • Download EnableEMLPreview.reg 
  • Right-click it and pick Merge (at the top of the list)
  • Close Windows File Explorer or log out and back in


You should now find that it works