How to sign digital certification by script or code?

[simon.zhao]

I want to sign some excel files digital certification by script or code,I don't want to do it by hand every time.It's very dull.If I forget to sign a file,there will be an error for it.If you know the solution,please let me know.Thanks.

[Jan Karel Pieterse]

I suspect the only way to do this is by using Sendkeys, which is not very reliable.