C++ Programs and Configuration Files

Hey guys. I haven't posted a question in a while. Either way, everyone knows those config files ( .ini i think) that are in games /programs sometimes right?
How would i write a program in C++ to make use of them? How would i process/organize the data from the .ini file etc. Error handling too i guess (In case the user like kills the INI file.)

Thanks a lot peeps.

Take a look at GetPriveProfileString and related methods