A few releases back, maybe around the version 1.240 time frame, Webmin started creating two unnecessary rpmorig files on one of my systems every time I do an RPM update. Here is a recent log:
# rpm -Uvh webmin-1.256-1.noarch.rpm
Preparing... ########################################### [100%]
1:webmin warning: /etc/pam.d/webmin saved as /etc/pam.d/webmin.rpmorig
warning: /etc/sysconfig/daemons/webmin saved as /etc/sysconfig/daemons/webmin.rpmorig
########################################### [100%]
Webmin install complete. You can now login to http://Server:10000/
as root with your root password.
Looking at these rpmorig files, they are exactly the same as the new files, and I have never modified them. This only happens on one of my systems (running Fedora Core 3), but I have done many Webmin updates on this same system in the past, and this problem only started recently. Also, it only happens for Webmin, not Usermin or any other RPMs.