You should investigate the Application.AutomationSecurity property. It may
do what you want. See Help for this method in the VBE.

--
Jim
"Arnaud" wrote in message
...
Hi,

I have found an article in msdn to open excel XLS/XLA file but I want it
start with disable macro.

// C#
Excel.Workbook wb =
ThisApplication.Workbooks.Open(@"c:\YourPath\YourW orkbook.xls",
Type.Missing, Type.Missing, Type.Missing, Type.Missing,
Type.Missing, Type.Missing, Type.Missing, Type.Missing,
Type.Missing, Type.Missing, Type.Missing, Type.Missing,
Type.Missing, Type.Missing);

any help appreciated thx
Arnaud