Internet Explorer 9でADODB.STREAMが動作しないのはなぜですか？

Question

Internet Explorer 9でこのコードを使用できないのはなぜですか？

function GetFile(FileName) { 
    var Contents1=null; 
    var Stream; 
    Stream = new ActiveXObject("ADODB.Stream") 
    Stream.Type = 1 //Binary 
    Stream.Open() 
    Stream.LoadFromFile(FileName) 
    Contents1 = Stream.Read() 
    FileSize = Stream.Size 
    Stream.Close() 
    return Contents1; 
} 

Answer 1

Contents1 = Stream.Read(-1); //-1 adReadAll