TWebUpdate's WUSetup.exe - problem with spaces

I am using TWebUpdate to restart my application after the update is downloaded.  When the path to restart the application has a space in it, the application does not restart successfully.  I can't examine why this is, since the shelled-out executable (WUSetup.exe) does not have its source code included in TMS Components.  Does anyone know how to make this work?  Thanks.