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Basically the same as a standard Windows app. I only have Win 10 on my work PC, but if I compile the examples PLUS a manifest (or the #pragma to do this) it is comparable to the Microsoft apps:

https://raw.githubusercontent.com/PennRobotics/permalink/mai...

Since the same UUID in the manifest applies to Windows 11 and Windows 10, I'm willing to bet this would look a lot like the Windows 11 version of notepad.exe when compiled on a Windows 11 machine.

There is a 'Screenshots' navigation on the side bar under the Product group. Here's a direct link though the page is set up to act like a single page app:

https://www.tecgraf.puc-rio.br/iup/en/screenshots.html

It looks like a hodgepodge of MS Windows look & feel from the Windows 95 to the Windows XP eras, combined with some even more basic looking controls.

IUP uses native GUI widgets and has been around for decades as is evident by those screenshots, some of which clearly were taken on some rather old versions of Windows.

You can check the screenshot from Windows 10 here https://github.com/gen2brain/iup-go/blob/main/examples/sampl.... If you are not using the manifest it will not follow the system appearance and will always look like Windows XP Classic.