allocation size overflow on large audio files when reading from file://...

[ghost]

I'm trying to read m3u file info from mixes that are about 200 mb and it works ok when I'm reading from the file from a web server using the http:// prefix and the path to the web server and file, but when trying to read a file from the the operating system (through the browser) i get allocation size overflow on large files. I'm developing a XUL based application using XUL based web browser as my basis, and loading the file in the browser using the file:// prefix works just fine, so it doesn't seem to be a browser limitation.

//loaded from server as web page works on large files
      var file = "nasa.mp3";

      var jsmediatags = window.jsmediatags;
      jsmediatags.read("http://192.168.1.2/"+file, {
         onSuccess: function(tag) {
            console.log(tag);
         },
         onError: function(error) {
            console.log(error);
         }

      });

      //loaded in side JS in XUL doesn't work on large files
      jsmediatags.read('file://'+file, {
         onSuccess: function(tag) {
           console.log(tag);
         },
         onError: function(error) {
           console.log(error)
      });

I'm not sure what the difference is in the background between loading the file as file:// or http:// so i don't understand what the underlying cause is.