The ChildProcessEnvironmentExceptions parameter notes exceptions to the ChildProcessEnvironmentDefault parameter when you want to specify child processes.
When you set the ChildProcessEnvironmentDefault parameter to Virtual, the ChildProcessEnvironmentExceptions parameter lists the applications that run outside of the virtual environment. When you set the ChildProcessEnvironmentDefault parameter to External, the ChildProcessEnvironmentExceptions parameter lists the applications that run in the virtual environment.
Specifying Exceptions to Running Child Processes in the Virtual Environment
You can specify exceptions to running child processes in the virtual environment. When the virtual application starts a notepad.exe child process, the child process runs outside the virtual environment.
[BuildOptions] ChildProcessEnvironmentExceptions=AcroRd.exe;notepad.exe ChildProcessEnvironmentDefault=Virtual