Microsoft has released two new Windows 10 previews and this previews support the High-Efficiency Image File Format or HEIF. It is said to be a rare event in which Windows released two previews on the same day. Microsoft is simultaneously developing two updates for Windows 10. The first Window 10 build is a part of RS4 branch which is expected to get announced in April. The second Windows 10 build is a part of RS5 branch which might be arriving later this year.

Microsoft’s Window 10 is a service which is different from other services of Microsoft. The service can get regularly updated to fix the bugs and also can get new features. The four major updates released by Microsoft till now are November Update, Anniversary Update, Creators Update and Fall Creators Update.

The RS4 for Microsoft Windows 10 build 17123 support HEIF. HEIF is an image container like HEVC which help in improving the quality, compression, and capabilities of the images in a format like JPEG, GIF, and PNG. It also supports the encoding image sequences, image collections, alpha or delta maps, live images and video, audio, and HDR. In order to try this new feature, you need to join the Windows App Preview Program for the Photos app and you should have the version 2018.18022.13740.0 or higher. You need to install HEIF and HEVC media extensions from the Microsoft Store. HEIF will then support in the Photos app and in any applications that use WIC, WinRT Imaging APIs or XAML Image control.

The RS5 for Microsoft Windows 10 build 17623 is for Windows insider. This is for them who have chosen the Skip Ahead option which means they will get builds from the RS_PRERELEASE branch. With the addition of HEIF support, Microsoft has added other features in this build. This includes a new safe remove experience for external GPUs in which it shows you which applications are running on the external device so that you can remove them without losing your data.