Software Deployment

Hi all-

I have an app I'm trying to package and everything works great so far except the very last step.  This app has a service that needs to be installed, and the only way provided by the developer is to call the EXE with an argument.  The following arguments are supported:

-RegisterService, -UnregisterService, -StartService, -StopService, -quiet (here's where the problem is).

So, to register and start the service, two commands would be required:

ica.exe -RegisterService followed by ica.exe -StartService.

The -quiet (or -silent) argument can be added to suppress the confirmation message that pops up when the service is registered (or unregistered).  So far so good, except that I can't make it work.  I've tried every CA type in my msi for running a exe, tried evoking a batch file with those commands, tried a vbscript, every combination of syntax I know, and if I include BOTH the -RegisterService AND -quiet I get an error message every time that says "Windows cannot find the file '-RegisterService -quiet' ".

If I use just the single -RegisterService argument, it works just fine, and if I run the command manually with both arguments it works, too.  It's clear that when triggered from within the msi it's not able to process two arguments.  I've found very little information about this online, but I have seen examples of CAs that call exe's with multiple arguments.

Am I missing something obvious here?

I'm not using any packaging suite to work on this, just editing the tables with InstEd It!  If I can't make this work, I'm back to pushing a scripted install via SCCM, which I'd rather not have to do.

Thanks!