方法1:
MyXL.Workbooks.Open Filename:=strFileName, Password:=strPassword

方法2:
Dim oExcel As Excel.Application
Dim oBook As Excel.Workbook
Set oExcel = New Excel.Application
oExcel.Visible = True

Set oBook = oExcel.Workbooks.Open _
(FileName:="C:\Test\xxx.xls", _
ReadOnly:=True, _
Password:="secret")

Set oBook = Nothing
Set oExcel = Nothing