Ya!....Make a .txt file and put this in it...
start Diablo~1.exe -w -title ">>>>Windowed Diablo II<<<<"
You can get rid of the -title "...if you want but i like it

Next u put the .txt file into the d2 directory
then rename it 2 *.bat and click YES i do wanna !@$#ing change the file type
Run it...
WOHO MESSENGER AND DIABLO II COWS AT THE SAME TIME

Any further help reply 2 my post or PM me