The resources.arsc checked-in here is generated using the aapt tool during the AIR Android build. 
The file that gets generated during the build and the file checked-in here should always be in sync. The resources.arsc that is checked-in here is the one that gets packaged in adt.jar. 

The file resourcese.arsc would change when any of the following occurs:
1. Some change is made in the AppEntry in <root>/products/AIR/Runtime/AppEntry/android/ that results in a change in R.java. This among others could be a new file in  <root>/products/AIR/Runtime/AppEntry/android/res folder.
2. The value of any string stored in <root>/products/AIR/Runtime/AppEntry/android/value/strings.xml is changed. 

The above are two known instances which needed the resources.arsc that is checked-in to be updated.
