Windows 10 build 21337 is now available in the Insider Dev Channel

[Windows Central]

New in-box apps, improved Virtual Desktops, and updated File Explorer experiences are top billing for today's build.
As per most weeks, Microsoft is back with a new Windows 10 insider preview build for those in the Dev Channel to download and start testing. Today's build is 21337, and is packing a handful of notable new features and changes that focus on enhancing the File Explorer and Virtual Desktop features.

Full story from the WindowsCentral blog...