Run game in win mode 800 x600

[:1]Hi..im new to D2...i need to run game in 800x600 win mode...i edited in proprieties that "-w" and its ok..the game run in winmode 800x600 but....when i choose game and connect the game its changing his resolution to 640x480...
can anyone tell me what to do to play game on 800x600 win mode?|||- make a game
- hit ESCAPE key
- select options
- select gfx options
- change resolution to 800x600
Of course you need to have the expansion installed. D2 without the expansion is limited to 640x480.