I can't tell about your version of excel, but in mine you first have to lock the the sheet before these settings have effect.....
Thanks Edwin for your feedback.
My excel version is 2007. Could you be a bit more specific on how to lock the sheet in ARIS script?. I went through all of the methods of the XlsSheet object and could not seem to see a relevant method doing this.
You can use the method XlsSheet.setPasswordProtect(<password>).
If you don't need the password, you can use "", but then the end user can unprotect the sheet without password.