Microsoft releases Windows 10 Redstone 5 Build 17666 for Windows Insiders

Microsoft releases Windows 10 Redstone 5 Build 17666 for Windows Insiders

Microsoft have a fresh new build of Windows 10 Redstone 5 for Windows Insiders on the fast ring and Skip ahead. The new build is packed with new features including a new clipboard, Sets improvements and dark mode for file explorer.


Sets gains many new features:

Bring on the acrylic! We love Fluent Design as much as you do – in today’s build you’ll find that Sets now have an acrylic title bar. We’re also adjusting the window border so that it’s now grey.

Recent Microsoft Edge tabs now show in Alt + Tab: Do you use Alt + Tab to quickly switch back and forth between apps? All of your recent Microsoft Edge tabs will now be included, not just the active one. Prefer it the old way? Use the “Pressing Alt + Tab shows the recently used…” setting in Multitasking Settings.

Should apps and websites open in a new window or a new tab? It’s up to you! The Sets section of Multitasking Settings now lets you set your windowing preference. If you choose “Window”, new windows won’t open into a new tab unless you explicitly click the + or drag with your mouse. Choosing “Tab” opens any new windows invoked from your running apps into tabs. As a reminder, if you would like to exclude any particular app from Sets, you can do this from this same settings page.

Want to mute one of your web tabs? You can now do that! When a webpage in Sets starts playing audio, you’ll now see a volume icon on the tab. Simply click it and the audio will mute, just like in Microsoft Edge.

Tabs will now restore with better performance – they’ll open in the background and use no resources until you go to the tab. This means you can restore a lot of tabs at once with no issues.

We’ve also made other fixes, changes, and improvements to Sets, including:

Task Manager has now been added by default to the list of apps where not to enable Sets.

We fixed an issue where right clicking a tab in the Sets title bar didn’t

bring up a context menu.

We fixed an issue where if Microsoft Edge wasn’t already open, clicking the plus button in Sets would open all of your default websites along with the new tab page.

The more I use Sets the more I can see how productive the feature is going to be.

There is a brand new clip board experiences

Clipboard has a new look and feel, it now has clipboard history and you can pin frequently used items:

Not only can you can paste from the clipboard history, but you can also pin the items you find yourself using all the time. This history is roamed using the same technology which powers Timeline and Sets, which means you can access your clipboard across any PC with this build of Windows or higher.

Other Changes

Other changes include a new dark theme for Windows Explorer, start tile folder naming and a lot of fixes.

As many of you know, we added dark theme support to Windows based on your feedback. This setting is available under Settings > Personalization > Colors, and if you switch it any apps and system UI that support it will follow suit. Since releasing this feature, our top feedback request from you has been to update File Explorer to support dark theme, and with today’s build it’s happening! Along the way, we also added dark theme support to the File Explorer context menu, as well as the Common File Dialog (aka the Open and Save dialogs).

I word of warning with this build, there is a known issue during the setup:

If your PC appears stuck at “Preparing to install…” somewhere between the 80%-100% in Windows Update – please be patient and wait up to 30 minutes (or in some cases – longer than 30 minutes) for this stage to complete.

I had this with the previous build and I just had to wait and eventually it worked.

Lookout for a hands on video soon.



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