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creo4 config.pro option documentation for: IGES_OUT_DWG_COLOR            

iges_out_dwg_color

yes , no *
Determines the export of RGB information and the user-defined colors in the drawing to the IGES file format.
yes - Enables the export of RGB information to IGES files. The user-defined colors in the drawing are exported to an IGES file as color-definition entities. All entities using these colors have a pointer to the corresponding color-definition entity in the IGES file.
no - Ignores the user-defined colors in the drawing when exporting IGES file. All entities using these colors are set to use the white color in the IGES file.