??? [ModelicaSystem] fix path handling in convertMo2FMU

Author: syntron

OMPython/ModelicaSystem.py

@@ -1624,7 +1624,7 @@ def convertMo2Fmu(
         properties = (f'version="{version}", fmuType="{fmuType}", '
                       f'fileNamePrefix="{fileNamePrefix}", includeResources={includeResourcesStr}')
         fmu = self._requestApi(apiName='buildModelFMU', entity=self._model_name, properties=properties)
-        fmu_path = self._work_dir / fmu
+        fmu_path = self._session.omcpath(fmu).name
 
         # report proper error message
         if not fmu_path.is_file():