Problem with VixVM_RunProgramInGuest

I am trying to run VixVM_RunProgramInGuest() with a Windows environment variable.

jobHandle = VixVM_RunProgramInGuest(vmHandle,

                                       %ComSpec%,                // command

                                       C:
test.bat,   // cmd args

                                       OPTIONS,                        // options

                                       VIX_INVALID_HANDLE,       // prop handle

                                       NULL,                     // callback

                                       NULL);            

The connection to the VM passes but it can't run %ComSpec%.

failed to run program in virtual machine '[data] new_windows_vm/new_windows_vm.vmx'(4 A file was not found)

My pass is connected to host (1048638)

about to open new_windows_vm/new_windows_vm.vmx

Why can't it interrupt the Windows environment variable?

thanks

-h