Windows xp not using chang port com1 to com2 on command line

I want chang port com1 to com2 in windows xp but it can not using . But in windows 7 it can do.

sample .

To map COM12 to COM2, type the following line at a command prompt, and then press ENTER:

change port com12=com2

• To display a list of current port mappings, type the following line at a command prompt, and then press ENTER:
  change port /query

• To delete the mapping for COM12, type the following line at a command prompt, and then press ENTER:
  change port /d com12

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