Cross platform desktop AIR captive runtime best practices

[Jeff Gomes]

Since Flash Player is going away, I am porting a Flex project to Mac and 
Windows desktop captive runtime applications.  My Flash Builder 4.7 
installation is on Mac.  I understand that the Windows captive runtime 
bundle has to be built on Windows.  I have Windows 7 running in 
Parallels Desktop on my MacBook Pro.

My online research has not turned up anything about having ADT build 
these from a .air or .airi file, so I assume it has to be done from the 
original project files.  If this is correct, what is the best way to be 
able to build both versions?  Do I need to have duplicate Flash Builder 
4.7 projects on both platforms?  That seems like a real nuisance!

~ Jeff