The Environment of the Project is changed every time it is run.

I have appended some paths to the Environment in the project properties in Debugging->Environment. The Environment now reads:

PATH=$(QTDIR)\bin;$(SolutionDir)/../External/bin/x64/release;$(PATH)

Expected: When i start debugging (F5 or Shift-F5) my project comes up and the changed environment settings are taken into account.

What happens: the environment settings are overwritten with the defaults, which are PATH=$(QTDIR)\bin%3b$(PATH)