how to change file extension in DOS ? 2012

If u need to change the extension open command prompt type "ren xxx.yyy xxx.zzz" where xxx is ur file name ( u can check dos file names by typing "dir" at command prompt) yyy is old extension, zzz is ur new extension.
morever if u wish to change the extensions of more than one file altogether..type "ren *.yyy *.zzz" 
hope it will help u..

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