For example, 3ds max, maya, photoshop?

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    All high-level libraries are either a convenient wrapper over WinAPI, or they draw and process all controls manually, for example, via OpenGL or Direct3D. The first are MFC, Windows Forms, GTK, and, in my opinion, wxWidgets. To the second - QT, WPF.

    You can draw your own GUI using OpenGL and Direct3D.

    If you want to find out what a particular program uses, look for it in the folder of the dll-library. For example, you can find MFC71.dll there. This means that the program uses MFC. If you see a dll containing Qt in its name, then QT is used. If the program uses pure WinAPI, OpenGL or Direct3D, then you will not find anything like that.

    • Thanks, it seems, you can see the used dll through Dependency Walker. - kotik

    Photoshop was previously precisely written using Qt, the commercial version. Now, maybe, too.

    • So he always braked like that :) - NewView