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Fix 1 – Check Attachment Handling Settings

1. In Outlook, go to “File” > “Options” > “Trust Center” > “Trust Center Settings…” > “Attachment Handling“.
2. Ensure that “Turn off Attachment Preview” is NOT checked.
3. Select the “Attachment and Document Previewers…” button.
4. Make sure that the previewer you wish to use is checked, then select “OK” three times.    

Fix 2 – Registry Fix

1. Select the “Start” button, then type “regedit“.
2. Select and open the Registry Editor.
3. Navigate to the following location:
   Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\PreviewHandlers
4. Creat New > String Value.”

5. Insert the “Value Data” to the following, then select “OK“
6. {21E17C2F-AD3A-4b89-841F-09CFE02D16B7}                      Microsoft Visio previewer
   {65235197-874B-4A07-BDC5-E65EA825B718}                      Microsoft PowerPoint previewer
   {84F66100-FF7C-4fb4-B0C0-02CD7FB668FE}                        Microsoft Word previewer
   {00020827-0000-0000-C000-000000000046}                        Microsoft Excel previewer