Ok, maybe i found a solution.
$('#fb').filebox({
buttonText: 'Select...',
onChange: function (newValue, oldValue) {
// This to show all files list on the textbox (otherwise it shows only last selected file with the "fakepath" issue)
var f = $('#fb').next().find('.textbox-value');
var listfiles = '';
$.each(f[0].files, function(index, item) {
if (listfiles.length > 0) { listfiles = listfiles + ', '+ '"'+item.name+'"'; }
else { listfiles = '"'+item.name+'"'; }
});
$(this).textbox('setText',listfiles);
}
});
// This to set the right property "multiple" on the input file tag
$('#fb').next().find('.textbox-value').prop('multiple',true);