adobe air application descriptor - os specific (mac/win)?

[Aureliu]

I created an app that runs on windows and mac osx.
Not I would like to have different install folders on each os in the application descriptor:

For windows:
<installFolder>Companyname</installFolder>

For max osx (no install folder):

<installFolder></installFolder>

Is it possible to set this inside the application descriptor without changing the xml file for each os?

E.g

<installFolder os="win">Companyname</installFolder>

<installFolder os="mac"></installFolder>

Thanks for hints...