Microsoft has made the Windows 10 Insider Preview Build 18941.1001 (20H1) to Windows Insiders in the Fast ring. Apart from fixes in the detected issues, this build hosts a couple of noteworthy enhancements as well.

What's new in 18941

Updating the Korean IME

Earlier in this development cycle, we released updated versions of both the Chinese and Japanese IMEs. As part of our ongoing efforts to modernize and improve your typing experience in Windows, today we're rolling out an updated version of the Korean IME to all Insiders in the Fast ring. This update is going out with the goal of making the IME more secure, reliable, and more beautiful to look at.

For those who're familiar with typing in Korean, the changes will be most noticeable if you write in Hanja; we have a new candidate selection window that uses modern controls and clearer typography:

We have also improved the algorithm used for text prediction when writing Korean using the touch keyboard. Text suggestions should now be more accurate and relevant to what you are writing.

With this change, we have a couple of known issues we're working on addressing:

- Typing very fast in Notepad can cause the IME to stop working. If you experience this, restarting Notepad should resolve it.
- Pressing hotkeys, such as CTRL + A, in while in the middle of writing a Hangul letter has inconsistent behavior across apps.

- We fixed an issue resulting in some users experiencing a large amount of lag when using the previous flight.
- We fixed an issue where explorer.exe would crash if you started a File Explorer search while in a OneDrive folder.
- We fixed an issue where if you searched for advanced Windows Update options, the search result would open to the main Windows Update Settings page, rather than the advanced one.
- We fixed an issue where Settings would crash if you clicked on the microphone section under Privacy Settings while audio recording was in progress by a Win32 application.
Known Issues
- If you have attempted to install Build 18936 or Build 18941 and experienced install failures with error code c1900101 - see below section regarding this issue.
- There has been an issue with older versions of anti-cheat software used with games where after updating to the latest 19H1 Insider Preview builds may cause PCs to experience crashes. We are working with partners on getting their software updated with a fix, and most games have released patches to prevent PCs from experiencing this issue. To minimize the chance of running into this issue, please make sure you are running the latest version of your games before attempting to update the operating system. We are also working with anti-cheat and game developers to resolve similar issues that may arise with the 20H1 Insider Preview builds and will work to minimize the likelihood of these issues in the future.
- Some Realtek SD card readers are not functioning properly. We are investigating the issue.
- Tamper Protection may be turned off in Windows Security after updating to this build. You can turn it back on. In August, Tamper Protection will return to being on by default for all Insiders.
- On occasion, the candidate selection in prediction candidate window for the Japanese IME doesn't match with the composition string. We are investigating the issue.




About Windows Insiders. After registering in the Windows Insider Program and installing your first Windows 10 Insider Preview build1, you will begin to receive updates to the device(s) you have enrolled. During the development process, the build number will change with each update. There are two different types of builds being delivered to your device(s):

Major builds
When a major build is released, is will include any combination of new features, updates to existing features, bug fixes, application changes, or other changes. For a major build, you will see the build number increment by 1 or more. Build numbers may or may not be consecutive based upon passing internal ring promotion criteria. For example, 14361 -> 14365.
Minor/servicing Builds
Also known as "Servicing" or "Cumulative" updates, these builds represent a smaller set of changes to a currently released Major Build. Servicing Builds often include bug fixes, minor operating system updates, or other smaller changes as needed. For example, 14361 -> 14361.1002 -> 14361.1003.
What to expect in each ring
While there is no set requirement for how build numbers are delivered to each ring, you will in general find the following to be true:
- Fast Ring: Major Build releases, very few servicing builds.
- Slow Ring: Major Build with minor build fixes attached.
- Release Preview Ring: Major Build change at a release milestone and then a continued series of Servicing Builds until the next release milestone is reached.
Definition of rings
The options for the frequency of Windows 10 Insider Preview builds are called "rings." Each ring presents a different level of stability and will be delivered on a different build cadence.
Rings are used to evaluate the quality of our software as it is released to progressively larger audiences. If the build passes all required automated testing in the lab, we will flight (release a build) with a new feature update, application, etc. to the first, most frequent, ring. The build will continue to be evaluated against a set of criteria to ensure it is ready to progress to the next ring. To get builds to Insiders faster, we changed the ordering of how we promote builds between rings, the ring progression criteria, and added a new ring.
Fast Ring
The benefit of being in the Fast Ring is that you will be among the first to use and provide feedback on new and improved features. If you have devices in the Fast Ring, you should be prepared for more issues that might block key activities or might require significant workarounds. Because we are also validating a build on a smaller set of devices before releasing, there is also a chance that some features might fail in some device configurations. If significantly blocked, report the issue to us in the Feedback Hub app or the Windows Insider forums and be ready to reinstall Windows using the Media Creation Tool, see instructions at Download Windows 10, or, for Mobile, the Windows Device Recovery Tool, see instructions at Windows Phone Device Recovery.
Slow Ring
The benefit of being in the Slow Ring is that you'll still receive new updates and features on the Development Branch, but the builds will be more stable. Builds are sent to the Slow Ring after feedback has been received from Insiders on the Fast ring and analyzed by our Engineering teams. Slow Ring builds include updates to fix key issues that prevent many Windows Insiders from being able to use the build daily. These builds are still from the Development Branch and could have issues that might be addressed in a future flight.
Release Preview Ring
If you want to be on the current public release of Windows 10 but still get early access to updates, applications, and drivers without taking the risk of moving to the Development Branch, the Release Preview Ring is your best option. The Release Preview Ring is only visible when your Windows build version is the same as the current Production Branch. The easiest way to go between the Development Branch to the current Production Branch is to reinstall Windows using the Media Creation Tool, see instructions at Download Windows 10, or, for Mobile, the Windows Device Recovery Tool, see instructions at Windows Phone Device Recovery.

About Microsoft. Microsoft Corporation, leading developer of personal-computer software systems and applications. The company also publishes books and multimedia titles, offers e-mail services, and sells electronic game systems, computer peripherals (input/output devices), and portable media players. It has sales offices throughout the world.

Product: Microsoft Windows 10
Version: Insider Preview (20H1) Build 18941.1001.rs_prerelease.190713-1700 *
Supported Architectures: 32bit / 64bit
Website Home Page :
Language: english, русский
System Requirements: PC **
Size: 6.2 Gb

Processor: 1.4 gigahertz (GHz) or faster.
RAM: 1 gigabyte (GB).
Free space on hard disk: 20 gigabytes (GB).
Graphics card: DirectX 9 graphics device or a newer version.
Additional requirements to use certain features.
To use touch you need a tablet or monitor that supports multitouch.
To access the Windows store to download and run apps, you need an active Internet connection and a screen resolution of at least 1024 x 768 pixels.