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.

[shades]

Howdy and welcome.

Is this specific to the Mac?

[simon.zhao]

Currently I only focus on XP system of Microsoft.