Qt Creator - Windows enviroment variables problem

Hello!
I have problem with Qt creator. My Qt creator's qmake evaluator cannot read enviroment variables. I have this code lines in my project file:

win32:RISDIR = $$system(echo %RIS_DIR%)

include($$RISDIR/src/servis/ris.pri)

When I execute qmake from windows command line, environment variable is successfully read and include evaluated, but when i put this *.pro file in Qt Creator, it cannot read environment variable. Then I try replace lines:

win32:RISDIR = $$system(echo %RIS_DIR%)

include($$RISDIR/src/servis/ris.pri)

with lines:

win32:RISDIR = C:/ris

include($$RISDIR/src/servis/ris.pri)

and then Qt Creator evaluate include successfully.

Another problem with environment variable is in debugger. When I use debugger option "Start and debug external application", the started application also cant read environment variables.

Interesting thing is, that in project configuration tab, in Qt Creator sidebar menu, successfully read and display all my environment variables including mentioned 'RIS_DIR'.

I am using:
* Qt Creator 2.3.0
* Windows 7 Professional
* Qt 4.7.0 with MSVC 2008

Any ideas will be appreciated. Thanks a lot.

Matriach