"Dir" command-line wildcard for extensions

Here’s a weird difference between Windows 2003 SP1 and Windows XP SP2: Suppose you have two files in the same folder, a.txt and b.txt_ , the effect of dir *.txt is as follows:

1. Windows XP SP2:
   

   a.txt
   b.txt_

2. Windows 2003 SP1:
   

   a.txt

It’s scary how it performs on SP2 – it can lead to dangerous stuff when you are using DEL to erase files …