Microsoft releases two new Windows 10 previews with High Efficiency Image File format

Microsoft today released two new Windows 10 previews for PCs. Both builds include support for the High Efficiency Image File (HEIF) format, but they diverge from there.

It’s rare for the Windows Insider program to get two new builds on the same day, though the last time this happened was only a month ago. That’s because Microsoft is developing two updates of Windows 10 at once. The first build is part of the RS4 branch, which represents the next Windows 10 update the company has yet to announce (but is expected to ship in April), and the second build is from the RS5 branch, which represents the Windows 10 update that will arrive much later this year.