Windows 10 build 17666 introduces Dark mode, Cloud Clipboard, Updated Notepad and more

Microsoft released Windows 10 Insider Preview Build 17666 (Redstone 5) to insiders in the fast and skip ahead rings. This is a big build with a number of new features, such as Sets improvements, a new Clipboard experience, dark theme for their file explorer, Linux & Mac line ending support in Notepad, Notepad Search with Bing, Search Previews, and custom Tile Folder names.

The latest Windows 10 Build 17666 is a big update with many new features and improvements which is available to download for Insiders enrolled in Fast and Skip Ahead Rings. You can get it by going to Settings>Update & Security>Windows Update>Check for Updates.

Windows 10 Insider Preview Build 17666
Windows 10 Insider Preview Build 17666

Microsoft is adding Cloud Clipboard in the latest build which brings new experience for users. Users will now be able to press WIN + V to be able to enjoy a new clipboard experience. You will be able to now pin the items from the clipboard along with being able to directly paste from the clipboard history.




The new clipboard experience in Windows 10 is powered by Microsoft’s cloud technology lets you access your clipboard across any PC. Users would need to enable this feature by going to Settings > System > Clipboard. The clipboard history supports plain text, HTML and images which are less than 1MB in size.

Microsoft Edge tabs are also getting some improvements with Microsoft adding all the recent tabs when you use Alt + Tab to quickly switch back and forth between apps. Muting tabs in Sets is now possible with Microsoft letting users to mute audio from a webpage by clicking on the volume icon visible on the tab. This option is similar to muting volume in Microsoft Edge.

Background performance of the opened tabs has now been improved significantly with the tab not using any resources in the background. A lot of tabs can be restored without facing any issues.

Amongst various other additions, Microsoft also showcased a dark theme for their file explorer. The company doesn’t have a full version of the dark theme at the current point of time but it teased how the file explorer would look if the ‘dark mode’ was implemented. The dark theme is meant to match Windows 10’s black taskbar and start menu. You can turn it on by heading to Settings > Personalization > Colors. Now, with the Dark Theme, the overall Windows 10 experience should be more uniform – if you like the look of it that is.

enable dark mode in Windows 10 File Explorer
enable dark mode in Windows 10 File Explorer

The company integrated the Bing search with the Notepad, which helps users to highlight words and search them right-away from the Notepad. Apart from this, users can also have results opened on a new page instead of a separate window by enabling the Sets.

Also, Microsoft Updated Notepad to support End of Line characters used by Linux, Unix, and Mac. This allows you to open files created in Linux or on a Mac in Notepad and have them render properly, rather than being displayed on a garbled single-line mess.

General changes, improvements, and fixes for PC




  • Microsoft fixed an issue with dll from the previous flight that could result in explorer.exe crashing every few minutes.
  • Microsoft fixed an issue resulting in VPN potentially not working after updating to the previous build.
  • Microsoft fixed an issue from the previous build where apps may appear to be missing in secondary accounts after receiving app updates from the PC’s primary account.
  • Microsoft fixed an issue from the previous flight resulting in a bug check with the error IRQ_NOT_LESS_OR_EQUAL in Tcpip.sys.
  • Microsoft fixed an issue where a border would be visible when you maximized windows in the last few flights.
  • Microsoft updated the design of This PC so that there’s no longer space displayed for the cloud files state icon (which isn’t relevant on this page).
  • The snipping toolbar (with WIN + Shift + S) will now follow your desired theme, light or dark.
  • Microsoft fixed an issue that could result in the Emoji Panel and the touch keyboard not displaying correctly if invoked immediately after restarting explorer.exe.

You can read the entire Windows 10 build 17666 release notes on Microsoft blog post.