how to change the file extension type in window xp

來源: kaiy 於 2007-11-10 05:09:44 [] [舊帖] [給我悄悄話] 閱讀數 : (151 bytes)

Hi,
Could you any one please tell me how to change the type of file extension, for example, from "pdf" to "rm" in window xp?
Thanks a lot

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