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Go to Start >> Programs >> AutoDesk >> AutoCADXXXX >> Reference Manager. In reference Manager, click on Add Drawings, select all the drawings that need to have x-refs repathed. The Refernce manager will then load all the drawings and related xrefs, fonts etc. Select the x-refs you wish to repath and then hit "Edit selected paths" button, a dialogue box appears, you can either type in the path or use the browse button on the right to browse to the desired folder. Then hit the "apply changes" button.