Do I have to modify every SIF?

Hi,

We currently have 12 different RIS images on our RIS server. Currently we
need to add some unattended lines to the SIF files regarding Regional
Settings. We know what we want to add, question is:
Do we have to update every single riprep.SIF file per image, or is there a
single SIF file we can update so the changes are propegated to all the
images? If there is such a 'general' SIF file, where do we have to put it or
where is it located?

In forward thanx.