The solution is to use a line like
myFile = new File(pathAsString);
so use the File(path) constructor. Then you will be able to write files in the application directory. Solution found at http://exaflood.de/syrotech/air-securityerror-filewriteresource/.
Is it possible to get some sample code describing the problem you're running into? What platforms are you having issues with?
Moved discussion to the Problems and bugs forum.
Hi, this is how I solved/hacked the problem.
var filePath:String = "app:/" + FileNames.DATA_COMMENTS_DIR + "/" + fileName;
Europe, Middle East and Africa