"An item with the same key has already been added" error when you open a list in VAMT 2.0 on a Windows 7-based computer

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KB Article: https://support.microsoft.com/kb/2383895

INTRODUCTION

When you open a list (.cil) in Volume Activation Management Tool (VAMT) 2.0 on a Windows 7-based computer, you may receive the following error message:

An item with the same key has already been added.