Microsoft has released a new preview of the upcoming Windows 10. This time around, the update has support for a File Explorer dark theme and enhancements for the Narrator.
This build comes from the RS5 branch, which represents the Windows 10 update that the company plans to release later in 2018. The company is also releasing builds in the 19H1 industry, which, as its name implies, will release the first half of 2019.
Windows 10 is deployed as a service, which means that new features are added continuously (on a regular basis).
Microsoft has released five major updates to date: November Update, Anniversary Update, Creators Update, Fall Creators Update, and April 2018 Update.
In May, Microsoft released the first beta version of Windows 10 that supports a dark theme in File Explorer. The build released today completes the addition of the dark theme. As you can see in the picture below, this will be the theme for File Explorer in the next version of Windows 10.
The new build includes several bug fixes and enhancements. Anyone interested can read the changelog from official webpage.