Couldn’t create window class error with a simple dialog-based Win32 application

I had a simple Win32 application fail to create its window (in my case, a dialog box, using either CreateDialog or DialogBox). I got back the error 0x583; unable to create window class. If I forced the window style on my dialog to create regardless of errors, my dialog was empty.

It turns out I was using themed controls in my manifest, but I didn’t call InitCommonControls. After that, my application worked.

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