Once the utility is fully opened, go to Edit (from the ribbon bar at the top) and click on Preferences at the bottom of the newly appeared context menu. Open up your Adobe Acrobat Reader application.This potential fix is typically reported to work for users that are encountering this issue on Windows 10. Several users that were totally unable to use the default previewer in Outlook have reported that the issue was finally resolved after they accessed the LAN settings of Adobe Reader and disabled the Automatically detect settings option. Registry issue – This was mitigated in the recent Adobe Reader version, but if you’re using older versions, you might need to do some registry fixing (either manually or by relying on a 3rd party fix that replaces the bad registry value automatically).Īs it turns out, one of the most common culprits that might end up causing the PDF Preview Handler error is an Adobe Reader setting called Internet Auto Detect.To fix the issue, you’ll need to access the Adobe Reader’s preferences and force it to become your global PDF handler. Adobe Reader is not set as the Default PDF Handler – If your default PDF viewer is not configured to be the default PDF handler and the PDF thumbnail preview feature is not enabled, expect to see this error in when attempting to preview PDF files in Outlook.In this case, you can fix the issue by forcing Adobe Reader to run in Compatibility mode with Windows 8. Adobe Reader runs on Windows Server – This error is very common in instances where the user tries to use the preview capabilities of Adobe Reader on a Windows Server version (most commonly Windows Server 2016).So if this scenario is applicable, you can fix the issue by opening Adobe Reader and accepting Accepting the EULA. As it turns out, Adobe EULA’s needs to be accepted before the application is able to preview files externally. Adobe Reader’s EULA wasn’t accepted – Another scenario in which this error will occur is a new Adobe Reader installation that was never opened before.Some users facing this issue have managed to get it fixed by accessing the LAN Settings and disabling the Automatically detect settings option. Internet Auto Detect is Enabled – As it turns out, one potential cause with the potential of causing the PDF Preview Handler error is a setting called Internet Auto Detect.
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