Unlocking VBA projects

I'm trying to open an Excel VBA project that was created and password
protected under Windows.

I have the password, but am not prompted for it when I attempt to open
the Excel VBA project for editing. I receive the "Project Locked -
Project is unviewable message"

How can I open a dialog box to unlock the project?

Clicking Tools->VBAProject Properties yields the same message.

Thanks
Rusty