Is it possible to create context menu items that work in windows explorer?

I can code in Visual C++, and I want to create a program that renames a file completely including the extension that I can run from right clicking on the file in explorer. Is this possible? Often times I'll want to change a files extension but rename won't allow it and then I have to open a cmd prompt and change it that way.
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This is done using context menu Shell extension:
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