在ADO中，Access数据库的jet引擎是不是不支持修改用户密码

使用ADOX（ADO externsion)读出和修改数据库的用户密码，提示如下：
Object or provider is not capable of performing requested operation

代码如下：
Dim user As adox.Users
Dim catalog As adox.catalog
Set catalog = New adox.catalog
catalog.ActiveConnection = "Provider=microsoft.jet.oledb.4.0;data source=e:\db1.mdb;user id=admin;Jet OLEDB:Database Password=cs.net"

For Each user In catalog.Users ''''此行出错
MsgBox user.name
Next

大侠指点呀