Windows Forms window changes its size when I create a WPF window

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You discovered that WPF calls SetProcessDPIAware(). It happens inside the module initializer for PresentationCore. Which is formally illegal, it must always be called before an app creates any windows or load DLLs that might cache the DPI value. Or in other words, lots of ways that this can go wrong, you only discovered the mild version of it as yet. Not normally a problem in a pure WPF app since PresentationCore always needs to be loaded before any window can be created.

They did leave a back-door to disable this behavior. Copy/paste this code, best in the AssemblyInfo.cs source file for your EXE project:

   [assembly: System.Windows.Media.DisableDpiAwareness]

But that isn’t much of a true fix of course, DPI virtualization is now always enabled for all of your windows. Get ahead by declaring your app dpi-aware in its manifest so that PresentationCore can’t mess this up. But with the inevitable side-effect that you’ll now discover that you need to fix your Winforms UI. It can only get smaller when you changed the Form.AutoScaleMode property or do something unwise like hard-coding the window size. The attribute is the Q&D fix.

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