How to Enable Automatic Complete for the Command Prompt (Cmd.exe)

While using the command prompt today, I started to wonder why the tab key didn't auto-complete the file paths I was trying to get to. Well, a simple search landed me on the Microsoft TechNet knowledge base article on how to fix it.
It turns out that the fix is a simple registry change:

To enable automatic complete for Cmd.exe, use Registry Editor (Regedt32.exe) to view the following registry key:

HKEY_CURRENT_USER/Software/Microsoft/Command Processor

Edit the CompletionChar value, and set the value of REG_DWORD to 9. Note that you do not need to restart your computer.