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phanethpho's avatar
phanethpho
Copper Contributor
Nov 07, 2025

Windows 11 Pro 25H2 build 26200.6899 - pane preview error

Dear Microsoft Support​,

After I upgrade Windows 11 Pro 24H2 to 25H2 build 26200.6899, when I pane preview file, it showed the message "The file you are attempting to preview could harm your computer. If you trust the file and the source you received it from, open it to view its contenst." UNC path also error.

 

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2 Replies

  • KapilArya's avatar
    KapilArya
    MVP
    Nov 09, 2025

    The error you mentioned is due to security change while you upgraded to Windows 11 25H2.

    It looks in Windows 11 25H2, Microsoft disabled File Explorer previews for Internet-downloaded files to stop a quiet NTLM hash leak. 

    With this change, the files downloaded from web sources can't be previewed like previous.

    However, there is no effect on locally generated files and you preview them as usual.

  • Allen's avatar
    Allen
    Icon for Community Manager rankCommunity Manager
    Nov 08, 2025

    Hi,

     

    thanks for posting, the Microsoft Tech community is not Microsoft Support and this board you’ve posted in is for help with the community platform.

    to contact Microsoft support please use the feedback hub in windows or visit https://support.microsoft.com.

    i will move your post to our windows 11 board.

     

    Allen 

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