As for the original topic:
Oh, guys, what are you wondering about? All he did is simply copied and renamed a file...
1. Goto your windows directory
2. Delete Explorer.exe
3. Copy MSpaint.exe to your windows directory
4. Rename MSpaint.exe to Explorer.exe
5. Reboot your computer and wonder...

Really, guys, what's so special about it? Will you wonder that your new file manager is MS paint? Don't think so. So calm down, alright?

- Alhexx