Hello, I am very sorry for not replying. I have been lately drenched into tons of exams (finals season) so I was not able to check the forum for a while.
Well, Reg2inf is currently a command line program. Meaning it is meant to run in a cmd window.
The simplest usage is reg2inf somefile.reg somefile.inf. There are other options and a usage screen that you can see if you just run reg2inf without any parameters, (eg: By double-clicking on it in explorer or executing reg2inf without parameters in the console.)
In order to help with integrating it into the windows shell I created a cmd file that is included with the zip file download. This command file, if placed in the SendTo folder will allow you to use Right click > SendTo to pass the reg file to reg2inf using explorer.
Ricktendo has created a addon for it in the main thread I see, so I guess that covers for now. I am planning on a GUI version at some point but don't have a lot of time these days.