Windows 11’s File Explorer preview pane is coming back for downloaded files, and this time Microsoft is keeping the security guardrails in place. A new ‘Preview anyway’ button will let you override the warning for files you trust, without having to manually unblock them through Properties or PowerShell.
According to Windows Latest, the feature is expected to begin rolling out in the coming weeks, possibly as soon as next month. It was first spotted in Windows Insider release notes back in April 2026 but never shipped to the general public.
The File Explorer preview pane that disappeared
In early October 2025, readers and reporters noticed that File Explorer stopped showing previews in the Preview pane for files downloaded from the internet. At first, many of us assumed it was odd behavior or a bug.
File Explorer offers two information panes. The Details pane shows metadata about a selected file such as its size, creation date, and, for images, deeper details like dimensions and exposure time. That pane kept working fine through the recent updates.
The Preview pane is the one most people lean on. It lets you glance inside PDFs, documents, and images without opening them in Office, Adobe Acrobat, Microsoft Edge, or any other program. That convenience is exactly what vanished for internet-sourced files.
Why Microsoft blocked previews
Microsoft later confirmed the change was intentional, and it was a security measure rather than an oversight. The restriction went live on October 14, 2025, after the company found that previewing unsafe files could potentially leak NTLM hashes.
File Explorer can’t simply assume every downloaded file is safe. When a file contains HTML tags that reference external paths, previewing it could expose sensitive credentials to an attacker, according to a Microsoft support document.
The company explained the risk directly: “This change mitigates a vulnerability where NTLM hash leakage might occur if users preview files containing HTML tags (such as ,
