Keyboard Shortcut to Cycle through Windows of same Application in Windows 7

There is no such a keyboard shortcut but holding Ctrl + clicking on the icon in the taskbar repeatedly will cycle through that program's open windows.

See https://superuser.com/questions/435602/shortcut-in-windows-7-to-switch-between-same-applications-windows-like-cmd.

Scott's answer is the closest one I've found to doing this. To summarize what he said:

Win + n where n is the number position of the application in the TaskBar. Then to cycle through, keep Win down and press n again.

(Updated thanks to @ZYinMD's comments - but also see their 1st comment)