HTML5 FileReader API & IE Support (reader.readAsBinaryString) [closed]

I have trouble reading the Uploaded File (XLSX) via FileReader API's "readAsBinaryString" method in IE10. "readAsText" method works fine. Has anyone come across this, does IE support this method? Am I missing something. Pls find the snippet below:

function handleFileUpload(evt){

    evt.stopPropagation();
    evt.preventDefault();

    var files = (evt.target.files || evt.dataTransfer.files);
    var output = [];

    for (var i = 0, f; f = files[i]; i++) { 
        output.push('<li><strong>', escape(f.name), '</strong> (', f.type || 'n/a', ') - ', f.size, '   bytes, last modified: ', f.lastModifiedDate ?                                   
        f.lastModifiedDate.toLocaleDateString() :   'n/a', '</li>');

        var reader = new FileReader();
        reader.onload = function(e) {
            var data = e.target.result;
                        alert("-- Data Length --" + data.length);
           };

         // Read in the XLSX file in Binary Mode.   
         //reader.readAsBinaryString(f);//<-- ***does not work if this method is used in IE10 (10.0.9200.16540C0), but works on Chrome***   
           reader.readAsText(f);//<-- ***Works on both Chrome & IE10 (10.0.9200.16540C0)***

    }//for 

}//handleFileUpload