Well, either way its much more efficient to just launch Warcraft III in Windows mode rather than going to the trouble of launching VMware then launching the game and also it'll be more resource efficient. Even if you have Dual/Quad core with 2+GiB RAM, what if you wanted to listen to music, encode a video, transferring data from HHD to another HHD while playing a game, i'm quite sure just using VMware will slow the others down... and by the way when you have VMware open the burning speed of any disc is reduced dramatically to like 0.1x speed since VMware will try to read and open the disc while your actual system is burning the disc so you'll have a conflict between them.
Edit: I've used VMware not too long ago so i know what i'm talking about. I use it to run my other operating system.
VMware won't slow anything down noticeably. Unless you're running some really heavy tasks. Music, DVD burning or transferring data. VMware doesn't continually access your disk. Besides, you cannot access a DVD burner while it's writing, the burning program will lock it. Encoding video might lose some performance, hardly noticeable though. Most encoders don't utilize multiple cores efficiently, plenty of CPU is left.
When I have my mobo back I'll make you a video of some multitasking, run several VM's while playing some game and burn a DVD. It runs fine. In fact I did such things several years ago on Prestonias, systems nowadays are a lot faster.
And resource efficiency is a nice point, but my answer assumed it wasn't possible to do natively. On the other hand, like I said, why would you want to be efficient with resources when you have plenty? Sure it uses more RAM, that's why you have plenty of RAM nowadays, so you have the freedom to do whatever you want.
Besides, your solution hasn't worked so far. A quick Google suggest you require the latest version of Warcraft 3.