iTunes 9.0.0.70, Vista Business SP2.

I'm trying to start iTunes with the "/setPrefInt carrier-testing 1" flag.

No matter what I try, iTunes doesn't load (no window, no iTunes.exe process in task manager, no error messages).

So far I've tried:
- Opening a standard command prompt and running: "%ProgramFiles%\iTunes\iTunes.exe" /setPrefInt carrier-testing 1
- Running the above within an elevated command prompt.
- Navigating to the iTunes folder and running: iTunes.exe /setPrefInt carrier-testing 1
- Creating a shortcut to iTunes.exe and adding /setPrefInt carrier-testing 1 to the end of the target.

If I run any of the above without the /setPrefInt flag, iTunes loads fine.

iTunes also won't load if i try other /setPrefInt flags (e.g. force-accessibility-off 1).

I'm confused - is iTunes actually meant to load when you run this command?