All you need to know about Windows 11 Dev Build 25140

by Alexandru Poloboc
Alexandru Poloboc
Alexandru Poloboc
News Editor
With an overpowering desire to always get to the bottom of things and uncover the truth, Alex spent most of his time working as a news reporter, anchor,... read more
Affiliate Disclosure
  • Microsoft has just delivered Build 25140 to the Insiders that do their testing on the Dev Channel.
  • The company fixed an issue where the active tab color didn’t match the command bar below it.
  • Check out the full changelog and share any new issues you might find while testing this new build.
w11 dev

Yes, Dev Channel Insiders, it’s time for a new Windows 11 Preview build to hit live and bring tons of changes and tweaks to the OS.

The Redmond tech company, also known as Microsoft, has just released a new Windows 11 Insider build 25140 to the Dev Channel.

This is the Sun Valley 3 (Windows 11 23H2) development for Windows Insiders, which will eventually become the version that is released in 2023.

What’s new in Windows 11 Dev Build 25140?

The new build adds plenty of new changes and improvements on top of the bug fixes that we’ve all grown accustomed to during all these years.

One of the biggest additions here is the fact that Microsoft updated this font to improve the legibility and screen rendering of over 200 characters at various sizes.

The company also added new glyphs to support Unicode 14 characters for the Nattilik language of the Canadian arctic.

Example of some of the new glyphs in the Euphemia typeface.

Fixes

[File Explorer]

  • Fixed an issue which was leading some people to unexpectedly see error 0x80070026 when copying files from network drives.
  • Fixed an issue where the active tab color didn’t match the command bar below it.
  • Fixed an issue where dragging to rearrange tabs wasn’t working sometimes.
  • Fixed an issue which could cause artifacts in the windows thumbnail preview in the taskbar if File Explorer was maximized and you used WIN + M to minimize it.

[Settings]

  • If you go to rename a drive label in System > Storage > Disks & Volumes, the current drive name will now be prepopulated in the dialog.

[Input]

  • Fixed an issue where selecting English (New Zealand) in OOBE was unexpectedly leading to the Arabic (101) keyboard getting selected.
  • Setting language bar hotkeys for switching input directly to specific non-IME input method should work now.
  • Some languages don’t support the speech recognition FOD. When an admin user tried to install one of those languages using the new Install-Language CopyToSettings command, some settings such as new user account locale, Input (Keyboard), and UPLL (User Preferred Language List) were not getting updated. This issue has now been fixed.
  • Fixed an issue causing Batang, BatangChe, Gungsuh, and GungsuhChe fonts to not render Korean correctly when using Office online apps when these fonts were not locally present on your PC.

[Task Manager]

  • Fixed a crash that could happen when switching modes in pages other than the Processes page.
  • We made a small adjustment to the intensity of the colors used in the heatmap on the Processes page.

[Other]

  • Fixed an issue where calls to CopyAcceleratorTable and CreateAcceleratorTable would fail if the LPACCEL parameter was the address of an odd numbered index into an array of ACCEL structs.
  • Fixed an issue with x64 emulation on ARM64 which could result in certain apps crashing on launch with error code 0xc0000409.
  • Fixed an issue causing audio to stop playing in certain apps after a minute.

Known issues

[General]

  • Windows Insiders on Surface Pro X devices will hit a black screen attempting to resume from hibernate on this build. You will need to power cycle (long power button shutdown) to get back into the device. It is recommended Insiders on these devices pause flighting until we release a build with this fix.
  • We are investigating reports that the Mica material and Acrylic blur effect is not rendering correct in OS surfaces like the Start menu, Notification Center and other areas.
  • We’re investigating reports that shutting down via the Start menu isn’t working for some Insiders and is unexpectedly rebooting instead.
  • Some games that use Easy Anti-Cheat may crash or cause your PC to bugcheck.

[File Explorer]

  • The up arrow is misaligned in File Explorer tabs. This will be fixed in a future update.
  • [NEW] We’re investigating reports that launching File Explorer in certain ways when using dark mode (for example, from the command line) is showing the body of File Explorer unexpectedly in light mode.

[Widgets]

  • [NEW] We’re working on the fix for an issue causing Widgets preferences (temperature units and pinned widgets) to unexpectedly reset to default.

[Live captions]

  • Certain apps in full screen (e.g., video players) prevent live captions from being visible.
  • Certain apps positioned near the top of the screen and closed before live captions is run will re-launch behind the live captions window positioned at top. Use the system menu (ALT + Spacebar) while the app has focus to move the app’s window further down.

ISOs are also available for Build 25140

The best is yet to come, as you are about to find out right now. You can download Windows 11 build 25140 ISO files from the official website.

That being said, keep in mind that you need to be a Windows Insider and log in with your Microsoft account to get the required download link.

Another thing to remember is that Windows 11 preview versions require activation with a genuine Windows key, just like the stable release.

Have you found any other issues after installing Dev Build 25140? Share your experience with us in the comments section below.

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