files.length is undefined in Internet Explorer

I'm using $(upload_button).bind('change', function(event) { var files = this.files; alert(typeof(files)); if(typeof(files)!='undefined') { } }); in my code with jQuery which is working fine in Firefox and Chrome but not in IE8(i.e., IE returns undefined for files.length, whereas others returns the value). So do anybody know how to resolve this?

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