How to update the library with out affecting routing in Pads 2005 ??

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    Hi everyone, good morning,i have the queries about updated library that means i updated drill and pad size only.so i don't want do it ECO method.instead of i export the part library ascii file (.p) format. after that i imported in my design.but it not importing .or else any one explain about procedure for updated library to be update in board file