Yes, in the current version (see download) the temporary loading of a user mapping file is built in. The file must be located in the same directory as the program files. It can be created as a copy of the original file. You can download an example from the MEP Tools download area. The file name must be CadDev.Cad.Mep.ManufacturerMapping.OWNAME.xml. Otherwise the file will not be found.