Rename Executable FF3RC1?

Hello,

The PortableApps FF2 allowed you to rename firefox.exe and then edit an ini file to specify its new name.

This was the only way I could get FF to run at work; without renaming the executable, the network antivirus program would delete firefox.exe from my memory stick when I tired to launch it.

I can't figure out how to rename the executable for FF3RC1 and still have FireFoxPortable.exe run it.

Thanks for your help.