Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
J:\>c:
C:\>cd test
C:\Test>dir
Volume in drive C has no label.
Volume Serial Number is B433-2F6F
Directory of C:\Test
12/28/2006 03:35 PM <DIR> .
12/28/2006 03:35 PM <DIR> ..
12/28/2006 03:35 PM 0 hi11112244.txt
1 File(s) 0 bytes
2 Dir(s) 151,278,936,064 bytes free
C:\Test>move hi11112244.txt hello11112244.txt
C:\Test>dir
Volume in drive C has no label.
Volume Serial Number is B433-2F6F
Directory of C:\Test
12/28/2006 03:36 PM <DIR> .
12/28/2006 03:36 PM <DIR> ..
12/28/2006 03:35 PM 0 hello11112244.txt
1 File(s) 0 bytes
2 Dir(s) 151,278,936,064 bytes free
C:\Test>
Edit: move hi11112244.txt hello11112244.txt is the command you are looking for, if you missed it from above.