Microsoft warns PowerToys users about PDF issues in Outlook

Microsoft recently posted a new document on its official support website that contains warnings about PDF issues with Outlook in various scenarios. The company explains the issue affecting Adobe Acrobat and PowerToys users and provides a workaround.

According to Microsoft, when users try to preview a PDF attachment in an email, Outlook displays the following error:

This file cannot be previewed because no previewer is installed for it.

Microsoft says two things can trigger the error message: a bitwise mismatch in Outlook and Adobe Acrobat, and the PDF preview module in the PowerToys application. You can solve the first problem by making sure you are using the 32 or 64-bit version of Microsoft Outlook and Adobe Acrobat Reader.

1. Launch Outlook and go to File > Office Account > About Outlook. Check if it is 32-bit or 64-bit.
   

   

2. Open the Adobe Acrobat Reader application and go to Help > About Adobe Acrobat Reader. Check its schema again, it should match the schema in Outlook. In other words, if you use 32-bit Outlook, Acrobat Reader should also be 32-bit (same as the 64-bit version).

Please check your PowerToys settings to make sure the number of bits matches or you are not using Adobe Acrobat. This document states that the PDF previewer in PowerToys is causing trouble for users.

1. Open the PowerToys app and go to the File Explorer Add-ons section.
2. Find the Enable PDF Preview module and turn it off.
   

   

3. #Go back to Outlook and try to open the PDF file.

Developers will release the required fixes as Microsoft says these two methods are a stopgap measure. Microsoft released a revised update for PowerToys earlier this month that primarily fixes bugs and does not add new tools or features.

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