Hello, I would like to use Concorde from R to solve TSP instances with solve_TSP(tsp, method="Concorde") Concorde is installed properly but the result is the following error: found: concorde.exe N\Users\jeszy\AppData: No such file or directory Couldn't open N\Users\jeszy\AppData for output My OS is Windows Vista. I run R with administrator privileges. I think concorde.exe called from R should also run with administrator privileges, but this is not the case. Any idea how to solve the problem? Best regards, Peter Jeszenszky