How to Disable Outlook from Previewing PDF Attachments

null null 

For default apps by file type, it should show Adobe as the default program in those file types.

It should actually be these steps

1. Open Outlook on your computer.
2. Go to the "File" tab in the top left corner.
3. Select "Options" from the left-hand menu. This will open the Outlook Options window.
4. In the Outlook Options window, select "Trust Center" from the left-hand menu.
5. Click on the "Trust Center Settings" button on the right-hand side.
6. In the Trust Center window, select "Attachment Handling" from the left-hand menu.
7. Uncheck the box that says "Turn off Attachment Preview" or similar option.
8. Click on "OK" to save the changes and close the Trust Center window.
9. Close the Outlook Options window.

After following these steps, Outlook should no longer preview PDF attachments