How do I get Air to remember the file path? - actionscript-3

Question

I have tried:
var file:File = File.documentsDirectory.resolvePath('');
and
var file:File = File.applicationStorageDirectory.resolvePath('myFolder');
Which seems to be how people recommend how to do it when searching for this. These work when I am testing the movie but when I publish the Air file it stops working and just defaults to the computer root folder everytime.
If anyone can shed some light on this I would greatly appreciate it.
Additional information
This is getting fustrating now. Here is the code in context. If anyone has any further ideas it would be a big help I just can't work it out it all works fine apart from remembering the file path.
var file:File = File.documentsDirectory.resolvePath(""));
videoselect1_btn.addEventListener(MouseEvent.CLICK, selectVideos);
function selectVideos(evt:MouseEvent):void {
file.addEventListener(FileListEvent.SELECT_MULTIPLE, file_selectMultiple);
file.browseForOpenMultiple("Please select a file or three...");
}
function file_selectMultiple(evt:FileListEvent):void {
for (var i:uint = 0; i < evt.files.length; i++) {
videostr += evt.files[i].nativePath + "\n";
videopath.push(evt.files[i].nativePath);
videoFiles = (evt.files.length);
}
video1output.text = ("You have selected " + videoFiles + " files" + "\n" + "\n" + videostr);
}
I did have file = new File(); in the selectVideos function but removing it meant at least it was going to the documents directory.