File Explorer Preview blocked for Google Drive mirrored files** Solution: Use OneDrive.

Case number: 7104727434

This post documents a File Explorer Preview Pane compatibility failure affecting Google Drive files after Microsoft’s recent File Explorer preview security change.

Microsoft Support confirmed that the current Windows File Explorer security model requires file metadata that Google Drive files do not provide in the expected way. Support also confirmed that OneDrive continues to support File Explorer previews because it uses a Windows-native local file model that preserves the required metadata.

The suggested workaround was to make the files local on the PC. That workaround failed. Google Drive files stored locally on the PC through mirrored mode are still blocked in File Explorer Preview Pane.

Additional reproduction:

A PDF was opened locally, printed using Microsoft Print to PDF, and saved directly into the Google Drive mirrored folder. The resulting PDF was generated locally by a Microsoft tool and saved locally on the PC, yet File Explorer still treated it as unsafe or blocked the preview.

This shows the issue is not limited to files downloaded from the internet, corrupted files, or cloud-streamed files. The unsafe/blocked preview behavior appears tied to the Google Drive storage path or integration itself.

Observed facts:

1. Preview Pane is enabled.
2. Google Drive files are blocked from preview.
3. Streaming-only Google Drive files are affected.
4. Locally mirrored Google Drive files are also affected.
5. Locally generated Microsoft Print to PDF files saved into the Google Drive mirrored folder are also affected.
6. OneDrive files continue to preview because OneDrive uses a Windows-native local file model that satisfies the metadata expectations of the current security design.
7. Microsoft Support’s “make the files local” workaround does not restore Preview Pane functionality for Google Drive mirrored files.

Impact:

This change makes Windows less functional. File Explorer Preview Pane is no longer reliable for Google Drive files, including locally mirrored files. Users lose the ability to inspect files quickly inside the operating system’s own file manager.

This change also makes the workflow less safe. Preview Pane normally lets users inspect files before fully opening them. Blocking previews forces users to open files in full external applications just to identify them, which is a worse security posture than a controlled preview workflow.

This also makes Microsoft’s own platform experience worse. A Windows security change is disabling normal File Explorer functionality for files stored in a widely used third-party cloud service, while Microsoft’s competing OneDrive path continues to work.

The practical result is that users are pushed toward third-party utilities and replacement tools to restore functionality that Windows File Explorer itself used to provide. Microsoft is effectively disabling a useful built-in Windows workflow, then leaving users to rely on external applications to recover the file-preview capability that was removed or blocked.

Compatibility concern:

The current Windows File Explorer security model preserves Preview Pane functionality for Microsoft OneDrive while breaking or degrading the same File Explorer functionality for Google Drive. The behavior is not a user configuration issue and not a file corruption issue. It is a Windows File Explorer compatibility failure affecting third-party cloud storage.

As of case 7104727434, Microsoft Support did not provide a confirmed Microsoft-supported workaround, administrator trust mechanism, or engineering escalation path that restores File Explorer Preview Pane functionality for Google Drive mirrored files.

I could not reply or add so I Edited to include this : Additional new flag that has been enacted that seems specifically designed to push users from Google drive to OneDrive. Even in mirrored files any activity triggers this pop up: 

Additional note: Microsoft Support directed me to post this issue in Tech Community. After posting, the discussion was not visible through normal navigation and could only be found through browser history. The page then showed: “This discussion has been marked as spam.”

So the support path provided by Microsoft did not produce a usable escalation route. The live support chat closed without resolution, and the Tech Community post is hidden as spam.