GeoIP MS COM API
We have a COM API available for MaxMind Country, Region, City, ISP, and Organization. To get GeoIP or GeoLite City to work with the new COM API, set GeoIP.set_db_path to be the directory containing GeoIPCity.dat. You have have to rename GeoLiteCity.dat to GeoIPCity.dat for this to work.

Note that the MS COM API is only tested on 32 bit machines and may not work on 64 bit machines. To install on a 64 bit machine, copy the dll to %windir%/SysWOW64, then register the dll. If that doesn't work, a client of ours has documented a MS COM API guide for 64 bit machines, or you can try the other windows APIs that work on 64 bit machines.

Source code for the MS COM API is available.