In windows numeric keypad not respond

i am vroby and at this time work with a little basic lGpl named sdlBasic.
you can found source and binary at

i have a problem in costruction of inputs command.
for this command i use keyboard event and translate to unicode with
the command
in linux it work perfectly. But in windows (all version)
numerical pad does not perform.
keysym works but unicode not translate.
What is the problem?

ps (sorry for my english)