I couldn't find any information on this here so I thought it best to post it. You can enable the compatibility layer in Windows 2000. The DLL is there, it just isn't activated for you to use on your own. When you've done this you can choose to run any shortcut in Windows 95, 98 or NT4...
What amazes me the most is how they fitted it onto a tiny 32Mbit cartridge. GBA games are usually 32, 64 or 128Mb. So this game is only 4 megabytes and smaller than many other GBAgames.
Now lets hope they release WC1 and 2 in a combined cartride for the GBA too.