Vista - rename bug from CMD

Hi,

Someone has noticed that the rename command (from cmd.exe) has changed
its behavior? before I used to rename files like this:

rename new*.txt test*.txt

and it will rename the files like this:

newname.txt to testname.txt

Now it seems to "ovewrite" the name to something like this:

from newname.txt to testame.txt

Note that the "n" has been overwritten. Someone know some workarround to
this? The help does not give much info...

I have hundreds of CMD and BAT files that I need to change...

Thanks,

Mariano.