Months after Apple made it possible to open multiple versions of apps (like the Finder) in a single window, Microsoft has begun testing out tabs in Windows apps (such as File Explorer), according to a new report.

Microsoft’s so-called Tabbed Shell feature will work in any Windows app, Windows Central reported today, citing unnamed sources. The blog posted its own mockups for File Explorer and Word to show how the feature might work.

Microsoft declined to comment on the feature, but if you go into the Feedback Hub for Windows Insiders, you’ll see that tabs in File Explorer is the fourth most popular request, behind adding a transparent theme, improving OneDrive storage…