Unable to preview any MS Office documents in Outlook 365 after Windows 10 repair

Brass Contributor

My Windows 10 networking stack died recently, requiring a rescue repair-install from a USB key. Everything is now working fine except I am no longer able to preview Office documents in Outlook 365. The error for Word is:


This file cannot be previewed because of an error with the following previewer: Microsoft Word previewer

Same issue with Excel and PowerPoint. PDF previews still work fine (using Acrobat), so it's not a mere of all previews being broken.


I've tried both a quick and a full online repair of Office 365. I've tried toggling settings in the Trust Center as described here https://www.technipages.com/outlook-fix-this-file-cannot-be-previewed .

Someone suggested the registry may need to be fixed but without any guidance on how. Any ideas for how to get Outlook preview to start working again for Office attachments?


Windows 10 Version 21H2 (OS Build 19044.1288)
Office 365 Version 2204 (Build 15128.20178 Click-to-Run)

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