Microsoft is now making available Windows 10 build 18351 for devices in the Fast ring of the Windows Insider Program. This is the preview number 28 rolling out to testers with new improvements as part of the April 2019 Update development.
Windows 10 build 18351, according to the company, is a minor update that only includes several fixes to resolve issues with File Explorer, Lock screen, Windows Sandbox, emoji version 12, and mouse customization problems.
Alongside the new improvements, Microsoft is also announcing several known issues for Windows 10 build 18351 at the Windows Blog.
Download Windows 10 build 18351
Although there are no ISO files for Windows 10 build 18351, the update is available immediately through the Fast ring. This preview build will download and install automatically on your device, but you can always force the update from Settings > Update & security > Windows Update, and clicking the Check for updates button.
You can also check out these resources: