I need Heroes of Might and Magic III version 4.0.

Oh crap, I completely forgot that you need to play through GR. So, here's the algorithm: open the launcher, click on the "create HD" button. Then rename this file to heroes3. And then, using GR, specify the exact path to it.

Note that when creating the executable, the HD+ button should be turned off. This is so that you can connect with them.

Also, we have a thread here /topic/10980/ where people arrange games directly on the forum