Opening PDF attachments in Outlook to default PDF viewer

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I have guided the topic through two different AI's because I am not familiar with the PDF-XChange Editor Version 9.0 and its possibilities or effects under Windows 11. Here are a few suggestions from the AI's software.

1. Adjust default program settings: Confirm that your default PDF viewer settings are correctly set in Windows 11. To check and modify default program settings
• Go to the "Settings" app in Windows 11.
• Click on "Apps" and then select "Default apps" from the left menu.
• Scroll down and locate the section "Choose default apps by file type."
• Find the .pdf file extension and change the selected pdf viewer in the Edge Browser and see if then works. If works your PDF viewer haves a problem.
2. Clear Outlook temporary files: Clearing temporary files associated with Outlook might help resolve any cached data causing the issue.
• Close Outlook.
• Press the Windows key + R to open the Run dialog box.
• Type %localappdata%\Microsoft\Outlook and press Enter.
• Delete all the files and folders within the Outlook folder.
• Restart Outlook and check if the issue persists.
3. Repair or reinstall Outlook: If the problem continues, consider repairing or reinstalling Outlook.
• Go to "Apps & features" in the Windows Settings app.
• Locate Microsoft Outlook in the list of installed apps.
• Click on "Advanced options."
• In the new window, click on "Repair" and follow the on-screen instructions.

Here I am also at my wits end. Hope this information helps you.