If the SCO OpenServer Development System software is installed on your machine, you can use nm(CP) instead of string(M) to extract this information. Use a shell script like the following to determine the file name that contains the routine, then proceed with steps 3-5 as shown in ``Using strings(C) to find kernel component''.
# for i in `find /etc/conf -name '*.o' -print` > do > nm $i 2 > /dev/null | grep sioopen > /dev/null && echo $i > done