Windows 10 Pro Insider Preview Build 11099 (Redstone 1) En_US x64

As with the previous build, this build does not include big noticeable changes or new features yet. Our focus through the holidays was on structural improvements to OneCore, which is the shared core of Windows across devices. The code refactoring and other engineering work we’ve been doing to optimize OneCore is nearing the point where we will be ready for teams to begin checking in new features and improvements. It will still be a few builds before any really noticeable changes show up, depending on when teams begin lighting up new features in their areas. We’re excited for Insiders to use this build to validate the work we’ve been doing to OneCore, so give this build a try and let us know of any issues you run into via the Windows Feedback app.

The progress dialog when copying or deleting files via File Explorer now shows up as expected.