>>Right-click on the Form in the Solution Explorer and choose "Copy". Then right-click on the Project and choose "Paste".
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>Great!
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>> Then, you probably want to rename the file (because it will call it "Copy of MyForm") ... just right-click on it to Rename it. Unfortunately, the IDE is still not smart enough to change any of the code in the Form class when you do this, so you'll need to open up the copied Form (in code view, not in designer view) and change the class name, which will still have the old Form's name). You'll need to change the class name, the constructor, and the a few properties in the generated code (this.Name and this.Text).
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>Sure, I can live with that. That is done quickly, and I have to do additional changes anyway.
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>One more question: Why didn't the other approaches work? What is going on? For example, create a duplicate of a form in Windows Explorer, and then add it to the project.
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>I forgot to mention: Using Visual Studio 2003.

Did you make the internal changes? Did you end up with the 2 classes with the same name in the same namespace?