Delphi Package Source File (*.dpk)
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When you create a Delphi package and save your package, RAD Studio asks you for a path to save your Delphi project file. The file name that you choose for your Delphi project file determines the name of your package. When you save your Delphi project file, RAD Studio saves a Delphi package source file in the same folder as your Delphi project file, with <package name>.dpk as file name.
Your Delphi package source file lists the units contained in your package. As your package changes, RAD Studio updates your Delphi package source file accordingly.