Windows 8 build 7758

Windows 8 build 7758 is a Milestone 1 build of Windows 8. Files from this build were first discovered on the Microsoft Symbol Server on 5 June 2022. A series of screenshots depicting this build and its respective installation media as seen from an internal Microsoft network share were later posted onto the BetaWiki Discord server on 22 June 2022.

This build is mostly similar to build 7746.

Windows Runtime
The beginnings of the Windows Runtime, such as the HSTRING type, an API resolver for the Windows Runtime, class activation and deactivation, and code for a class cache that matches CoClassIds to actual APIs, have been added to  in this build. However, it is likely that there were no actual user-facing Windows Runtime APIs at this point.