Currently, our Windows builds do not include an application manifest. This causes issues when using the WS_EX_LAYERED extended window style for child windows - specifically, semi-transparency effects do not work as expected.

Windows requires an application manifest declaring compatibility with Windows 8 (or later) for child windows to support the WS_EX_LAYERED style properly. Without this manifest, the system silently ignores layered attributes on child windows, leading to missing transparency and rendering issues.

For example, manual test *embeddedwindows* in *qtbase* can be examined. It was fixed some time ago by adding the application manifest.