The VS 2008 test is compiled into DLLs that, as far as I know, cannot directly receive command line arguments.
You can add the configuration file "app.config" for the dll and use it instead.
, mstest .config , .
...
mytest.dll
mytest.dll.config
lib.dll
lib.dll.config
lib.dll mytest.dll, , lib.dll.config , - .