With regard to support for legacy Win32 applications, we have heard different information.
Windows 10X found proof of Win32 app support
About support for legacy Win32 applications, we have heard different information. Some argued that there would be support; others said that it would be incomplete and limited. Finally, it was recently reported that the new operating system users would be limited to apps from the Microsoft Store and web apps.
Users who tried out the new build of Windows 10X found evidence that there is a dedicated section for developers in the settings. The first switch allows you to install signed applications and use special developer tools. The second Win32 switch will allow installing unsigned applications.
When you turn on the switch, a message appears that reads: “Are you sure you want to allow all applications? Allowing all applications on your device to run can harm your device or data. ” The system also warns that it will not work to go back, allowing the launch of all applications.
This does not mean that Windows 10X will allow you to install Win32 when the first version is released this spring. So far, this suggests that Microsoft is still planning to add support for Win32 applications in the future, and developers will test their applications.