Microsoft's Window Explorer bug?

Today found out the wierd thing in the browser...

3 file names:
001.txt
002.txt
003.txt
2.txt


Sort By Ascending

Sort by filename in the Window Explorer, the order will become
001.txt
002.txt
2.txt
003.txt


Sort By Decending

Order by filename decending in the Window Explorer, the order will become
003.txt
2.txt
002.txt
001.txt

As conclusion, the "0" in front the filename might not be taken as consideration in sorting...