Access an application from another application

Hello (and sorry for my bad english )

For Android.

I have 2 applications ("myapplicationA" and "myapplicationB").

In "myapplicationA", i want to list the files in a folder of the application "myapplicationB".

The code (in "myapplicationA") below works:

var urlStr:String = "file:///data/data/air.myapplicationA/myapplicationA/Local Store/myfolderA";

var file:File = new File(urlStr);

var listFiles:Array = fileCopy.getDirectoryListing();

trace(String(listFiles.length)); // return is good

The code (in "myapplicationB") below works:

var urlStr:String = "file:///data/data/air.myapplicationB/myapplicationB/Local Store/myfolderB";

var file:File = new File(urlStr);

var listFiles:Array = fileCopy.getDirectoryListing();

trace(String(listFiles.length)); // return is good

but this code (in "myapplicationA") dont work:

var urlStr:String = "file:///data/data/air.myapplicationB/myapplicationB/Local Store/myfolderB";

var file:File = new File(urlStr);

var listFiles:Array = fileCopy.getDirectoryListing();

trace(String(listFiles.length)); // return is good

an idea?

Thanks