I'm using the features of the new browsers (HTML5 API - files prop) to get the size and the type of the uploaded files with jquery in this way.

$(function() {
$('#myFile').bind('change', function() {
//gets the size and the type of your file.
var fsize = $('#myFile')[0].files[0].size;
var ftype = $('#myFile')[0].files[0].type;
alert("size : " + fsize + " type : " + ftype);
});
});

I would like to know if I can use external libraries (Modernizr, html5shim, etc) to implement these features

even on older browsers, such as IE8.

Thanks.