MixedLanguage Sample cannot be build in vs2010

Hi,

I try to build the mixed language sample from c:\Program Files (x86)\Intel\Composer XE 2013\Samples\en_US\Fortran\ and ran throw the steps in the README.TXT file but when trying to 

- Open the solution
- Right click on the C_USEDLL project and select References
- FDLL.vfproj should be highlighted. Click Remove Reference. Click OK.
- Right click on the C_USELIB project and select References
- FLIB.vfproj should be highlighted. Click Remove Reference. Click OK.
- Right click on the C_USEDLL project and select Project Dependences
- Check the box Depends on > FDLL. Click OK.
- Right click on the C_USELIB project and select Project Dependences
- Check the box Depends on > FLIB. Click OK.

it is not possible to remove the references. As a result the whole example can not be build on my win8 / win7 vs2010, vs2012 systems.

Find attached the message displayed (sorry it's in German)

Kind Regards,

Thomas