Enabling "Source code files (Monaco)" in "File Explorer add-ons" prevents preview in file explorer

[cowlthr-pdxedu]

Microsoft PowerToys version

0.90.1

Installation method

WinGet

Area(s) with issue?

File Explorer: Preview Pane

Steps to reproduce

• Install Power Toys
• Create a text file with a .txt file extension
• Select the file with file explorer

✔️ Expected Behavior

• When selected in file explorer, a preview of the selected file

❌ Actual Behavior

• In file explorer you see the text "This file can't be previewed"

Additional Information

Also noted as a problem on this subreddit : https://www.reddit.com/r/WindowsHelp/comments/1cwksr3/this_file_cant_be_previewed/

OS: Windows server 2025

Other Software

No response

[htcfreek]

/bugreport

[microsoft-github-policy-service]

Hi there!

We need a bit more information to really debug this issue. Can you add a "Report Bug" zip file here? You right click on our system tray icon and just go to report bug. Then drag the zipfile from your desktop onto the GitHub comment box in this issue. Thanks!

[microsoft-github-policy-service]

This issue has been automatically marked as stale because it has been marked as requiring author feedback but has not had any activity for 5 days. It will be closed if no further activity occurs within 5 days of this comment.