Announcing Windows 10 Insider Preview Build 17639 for Skip Ahead

Hello Windows Insiders!

Today, we are releasing Windows 10 Insider Preview Build 17639 (RS5) to Windows Insiders who have opted into Skip Ahead.

What’s new in Build 17639

The next wave of Sets improvements is here

What belongs together stays together – we designed Sets to help you keep webpages, documents, files, and apps connected. We’ve been hard at work since our first wave of Sets improvements for RS5, and when you install today’s build you’ll find:

Drag and drop app tabs within and between Sets windows is now supported: It works just like it sounds! You can now drag an app tab around within the Set or combine tabbed app windows into Sets.

Note: If you open a Microsoft Edge tab outside of a Set, you can’t drag and drop it into a Sets window. Drag and drop for Microsoft Edge web tabs within Sets isn’t supported yet and you may experience a crash if this is attempted.

Tabs are now bubbled up in Alt + Tab: Have Photos, Microsoft Edge, and OneNote tabbed together? You can now use Alt + Tab to switch between them. Prefer to only show the primary window in Alt + Tab? There’s a new setting – more on that in just a moment…

Note: If you have multiple Microsoft Edge windows in a Set, only the one most recently accessed will be visible in Alt + Tab.

Improved Settings for Sets: We’ve updated the Settings for Sets via Settings > System > Multitasking. To start with, Sets now has its own section on this page, and is searchable (try typing “Sets” or “tabs” and it will appear in the dropdown). We’ve also added a setting to control the Alt + Tab behavior mentioned above.

New Sets section highlighted under Multitasking Settings.

File Explorer & Sets Improvements: We’ve heard your feedback – you’d like it to be easier to get two File Explorer windows grouped together, and we’re working on it. To start with, you no longer need to hold CTRL on the new tab page to launch a File Explorer window in a tab (this was a temporary necessity with the last wave). We’ve also added a new keyboard shortcut to open a new tab when a File Explorer window is in focus: Ctrl + T. Remember, you can use Ctrl + N to open a new window, and Ctrl + W to close the window/tab.

Finally, we’ve added some new UI for easily opening new tabs and windows in the File Menu.

Showing File Explorer’s File menu, with new Open new tab option.

And also, in the context menu when right-clicking on a folder.

Showing a folder’s context menu in File Explorer. Open in a new tab is highlighted.

New context menu options for tabs in Sets: If you right-click on a Sets tab, you’ll discover we’ve added several options for you to leverage, including “close other tabs”, “move to new window”, and “close tabs to the right”.

Showing context menu for a tab in Sets, has Close tab highlighted.

Improvements to Previous Tabs: We’ve done a few things to improve the experience in this space, including:

• You can now pick and choose which Previous Tabs you want to restore, instead of only being able to restore all tabs.

Other Sets improvements and fixes based on your feedback, including:

Here are a few things we’re still working on that aren’t quite finished / resolved yet:

Coming soon: We’re planning to enable Sets for more Win32 (desktop) apps including Office! In order to try this new experience out with Office, you’ll need to be an Office Insider running the latest Office builds. Sign-up to be an Office Insider today if you aren’t already!

Bluetooth battery percentage in Settings

In Bluetooth & other devices Settings, you can now check the battery level of your Bluetooth devices. For Bluetooth devices that support this feature, the battery percentage will update whenever your PC and the device are connected.

Bluetooth page in Settings. Shows Surface Pen with 71% battery.

Windows Calculator Improvements

Windows Calculator has been updated (version 10.1803.711.0) to now correctly calculates square roots for perfect squares (integers that are squares of other integers). Because of the arbitrary precision arithmetic library used by the Calculator app, the square root calculation is an approximation calculated using the Exponential Identity function.

Previously, when you would calculate the square root of 4, the result would be 1.99999999999999999989317180305609 which would be rounded to 2 when displayed, because we calculated enough digits to do the rounding correctly. However, as soon as you subtract 2, you would see the remaining digits.

After this update, the square root calculation now recognizes perfect squares and correctly returns exactly 2 for the square root of 4.

General changes, improvements, and fixes for PC

Known issues

Recommended Training for Windows Insiders

We’d like to take this opportunity to highlight some training courses that might interest some Windows Insiders from the Microsoft Professional Program:

Insider Story

Check out this article on the Windows Insider website to find out how Windows Insider Vincent Pendleton uses Paint 3D as a go-to tool for teaching astronomy!

Windows Insider Vincent Pendleton uses Paint 3D for teaching astronomy!

No downtime for Hustle-As-A-Service,
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