howto change the file ext name

some1 told me to use windows reg editor. but how to open it and do it?
please help.
thanks

所有跟帖： 

• no need if u don't know. use -ppzcgg- ♀ (61 bytes) () 03/16/2005 postreply 11:50:47

• thank you..................... -xyz100- ♂ (0 bytes) () 03/17/2005 postreply 10:23:00

• You guys are wrong...Look Look -Grant- ♂ (341 bytes) () 03/16/2005 postreply 19:29:28

• grant, plz go back 2 where u c -ame,_u_r- ♀ (149 bytes) () 03/16/2005 postreply 23:20:13

• Thank you..................... -xyz100- ♂ (0 bytes) () 03/17/2005 postreply 10:24:09

• I am sure that you should go -Grant- ♂ (885 bytes) () 03/19/2005 postreply 09:23:40

• Thank you..................... -xyz100- ♂ (0 bytes) () 03/17/2005 postreply 10:23:36