Hello, I have been experimenting with Gestpoi today. It seems that it works with some maps' poi.dat file, and then not with other maps poi.dat file, for no apparent reason.
What you do is go here:
[Please Register or Login to download file]
Then you download the 1.40 beta, and then the 1.40 beta 2 upgrade is installed after the main program.
What you'd do if you are unable to use the program to extract your poi.dat, is use the compress function and then click "generate empty poi.dat" I have not confirmed that the 1kb poi.dat this generates will work, but I am pretty sure it will.
If you are able to extract it, the process is quite simple. You can go to the extracted files folder and delete whatever you want before recompressing, or you can use the built in handler option but then that is a bit clumsy.
I guess it is a bit hit or miss, but my suggestion is that you first try to extract the poi.dat and if it works then yahay and woop-woop, and if it doesn't extract like it should then you have an incompatible map and you should use the generate empty poi.dat option. It seems completely random whether or not the maps work, for example I tried six different 870.X maps and it worked on two of them, France and Iberia, and then the website says it will not work with 7.X and above maps.. so clearly it is hit or miss, you will just have to try and then see. Maybe if I downloaded all the different versions of the 2gb Europe map I could try them all, but I have only 2 mbit internet here in Spain so it is going rather slowly for me, I am only halfway on the one that there is a meta file for, and I been going all day as well as some of yesterday...