Are you using Flash , Flex, Dw?
I am using Flex builder 3, flex sdk 3.3
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AIR is very particular about loading remote code. RSLs in particular aren't supported.
Read up on the security side of AIR and check out Ethan Malasky's blog about it.
You can load remote content, but you need to use one of the loaders to bring it in, RSLs simply won't work.
It was quiet helpfull to understand loading "modules" in AIR. Though I am still trying to load RSL in AIR using similar technique.
Wish to have an easier solution
I think, though I have not tested... you should be able to get RSLs working if you deploy them alongside the main app in (i.e. so they are in the application directory) and have them loaded from there.
This however, defeats the entire purpose of RSLs in my opinion!
In short, you are better dumping RSLs and using shared code modules instead (check Alex's blog for more details)