Loading external arrays into flash 8

I am currently working on a tile based videogame and am using arrays to stroe what tile goes where, hewever these get to be really big so I want to save them in a text file and load them as needed, and I have tried the following code:
varReceiver = new LoadVars();
varReceiver.load(“external.txt”);
varReceiver.onLoad = function() {
trace(typeof (this.myArray)); // string
this.myArray = this.myArray.split("|");
trace(typeof (this.myArray)); // object
trace(this.myArray.length); // 4
};
However, everytime I run this, it says:
Error opening URL “file:///C|/Documents%20and%20Settings/Owner/Local%20Settings/Temp/Temporary%20Directory%201%20for%20lv%5F11.zip/external.txt”
Any thoughts on what I can do to get it to open the file told?
My other question is what would the code look like the split it into an array readable by flash like myMap = [[1,1,1],
[0,1,2]]; for example.
Thanks in advance for your help.