Hello.
In version 1.2.0 your local data go in the directory thar David said to you: C:\Users\<UserName>\AppData\Local\openGribs\XyGrib
The directory structure of the program has changed so "C:Xygrib/Data/Config" is not used anymore (if I am not mistaken). After installing version 1.2 copy your xygrib_poi.in filke in C:\Users\<UserName>\AppData\Local\openGribs\XyGrib\ (which was authomatically created by the instalation) and you'll see your POI when you open XyGrib 1.2.0.
Regards,
Tropelio
PS. Sorry David, I was writting while you were also answering.