Yesssss
GOG is having a pretty big sale right now, so I got myself digital copies of Myst and Heroes of Might & Magic III. I have old disc copies of the games but they don't work on newer OSes most of the time, and GOG reformats/tweaks them to work on Vista / Win7 / Win8.
Coincidentally I was getting really frustrated a few weeks ago trying to get Heroes III to run. I got a sort of crippled version running but it wasn't working very well. This one should work better.
I only just found out about this website and it's like a treasure trove of old PC games, including a lot that Steam doesn't have, probably because they're so old. Steam has Heroes V or VI, but not anything earlier, and THOSE are the ones I liked playing. Once it started going 3D I just tuned out.
Also, DRM free and unlimited installs for your own personal use.
\O/