Windows 10 build 17672.1000 (rs prerelease)

Windows 10 build 17672 (rs_prerelease) is the twelfth Insider Preview build of Windows 10 October 2018 Update. This build was released to Windows Insiders in the Fast Ring on 16 May 2018.

Changes

 * The Books pane in Microsoft Edge can now be refreshed using a pull gesture.
 * When an e-book is pinned to the Start menu from Microsoft Edge, you will now see a live tile that cycles between the book cover and the current completion progress.
 * Added a new option to choose the scale of the print-out when printing PDF files from Microsoft Edge (actual size or fit to page).
 * Updated Timeline to include the ability to cycle through Sets tabs in addition to being able to see the number of tabs to restore with a Sets session.
 * If Windows Subsystem for Linux is enabled, a new option to open a new Linux shell will be added to the right-click menu that appears if you press Shift on a blank area in File Explorer.
 * Added preliminary support for same-site cookies in Microsoft Edge and Internet Explorer 11.
 * If a Bluetooth device is running low on battery, a notification will appear to alert the user.
 * When you hover over the leaf icon in the Status column in Task Manager, a tooltip will appear to describe what it means (this app is suspending processes to help improve system performance).
 * General improvements, changes and bug fixes listed in the official announcement.

General

 * Narrator can read extra text when Alt+Tab is invoked.
 * Dark theme support is incomplete in File Explorer and the Common File Dialog.
 * If you use Remote Desktop, project the screen, or use multiple monitors, there's a chance of  hanging. Microsoft Edge can also hang in a similar fashion with this issue.
 * You cannot enable Developer Mode through the For developers Settings page in this build.

Sets & Office

 * The top of some Win32 desktop apps may appear slightly underneath the tab bar when they're opened maximized. To fix this issue, restore and re-maximize the affected window.
 * Sometimes closing one tab can minimize the entire set.
 * Tiling and cascading windows do not work for inactive tabs.
 * Opening an Office document while the same app has an existing document open may cause an unintended switch to the last active document. It can also happen if you close a sheet in Excel while other sheets are open.
 * Locally stored files and cloud files that are on non-Microsoft cloud services are not automatically restored.