Windows XP Easter Egg - "Hello, World!"

1. Open your resource editing program (I used XN Resource Editor)

2. Open "C:\WINNT\explorer.exe" or "C:\Windows\explorer.exe" depending on what service packs you have installed.

3. On the left panel, open up Dialogs

4. Next, open number 7.

5. Finally, click English (United States), and look at the dialog on the right.

*Note: Your results may vary. This was tested using Windows XP without any service packs installed, and using XN Resource Editor, available from http://www.wilsonc.demon.co.uk/d10resourceeditor.htm
As always, your mileage may vary.