In the OMNeT++ MinGW command line window, you should be able to have SUMO simulate an example scenario by changing the current directory to /c/Users/user/src/veins-4.4/examples/veins/
using cd ../veins-4.4/examples/veins
and running
/c/Users/user/src/sumo-0.25.0/bin/sumo.exe -c erlangen.sumo.cfg
Here is what I am doing. I am running MinGW from omnet++ and entering this dictionary d/sumo-0.25.0/bin/sumo.exe -c erlangen.sumo.cfg. As far as I understand, this " erlangen.sumo.cfg" file is located inside the veins folder.
/c/Users/user/src/veins-4.4/examples/veins/
"