Race selection menu.

How do you add or remove entires there?

For example, I would like to remove the option to select "orc" but I don't really know where to start.

Anyone who knows?

in war3.mpq there is a file named UI\FrameDef\Glue\PlayerSlot.fdf
this appears to include the options for coosing a race (human,elf, random, etc.) i havent tried this because i cant get .fdf files to stuff back into the mpq but theoretically if you just remove the line that says MenuItem "ORC" then you wont be able to select them. adding a race may be another matter entirely because i believe "ORC" and "HUMAN" and the like are global constants that are used in quite a few of the .fdf files. I believe they are declared in GlobalStrings.fdf, interestingly enough right alongside "DEMON". pure guesswork here, but there may be enough of the demon race left intact to build whatever you wanted on to that without having to do even more raping and pillaging of the code. as i said, this is all theoretical as i havent been able to do anything with the .fdf files, so dont be surprised if your computer tries to eat you for changing the wrong function.