Hi,
you can use the api below to check the upload file name before upload and block it there.
//Fires when files are selected.
function CuteWebUI_AjaxUploader_OnSelect(files)
{
//change the files array would take no effect.
var name=files[0].FileName;
var size=files[0].FileSize // (or -1)
//return false to cancel it..
}
regards,
Ken