One of the ways, assuming that OWNER is the 10th entry in your file, is to do this:
1.) Open the file for read
2.) Read line (using fgets() will do) 10 times.
3.) When you read 10th line, use strtok() function looking for '=' sign. (read manual about strtok())
4.) There you go, you have the value
This should take no more than 5,6 lines of code (excluding the special error checking).
p.s. don't forget to close files and do the clean up.
