Preview is broken

For issues where a recent update broke preview functionality, the supported path to complain and request a fix is to submit feedback directly to Microsoft rather than via user forums.

Use one of these options:

1. Built-in feedback in the product or Windows
   • Open the affected Microsoft app or Windows desktop.
   • Use the built-in feedback mechanism (for example, Feedback Hub in Windows) to file a report describing:
     • The exact build/update version.
     • What preview scenario is broken (PDF, Word, etc.).
     • Steps to reproduce and impact.
   • This sends telemetry and details directly to the engineering team.
2. Microsoft 365 / Office feedback
   • For Office apps (Word, Outlook, etc.), use the in-app feedback option (for example, File > Feedback) to submit a complaint and request a fix.
   • This is the channel monitored by the product team; user-to-user forums do not reach them.
3. Community and Q&A
   • If using Microsoft Q&A or Answers forums, note that moderators and other users can only suggest workarounds. They cannot change or roll back updates. Use those forums mainly to find temporary workarounds while the product team addresses the issue.

References:

• "This file can't be previewed" error in Word, Excel, or PowerPoint
• Update that restricts preview of PDF - Microsoft Q&A