Good to see this is still going! It's been a while for me.
These days I'm primarily using Linux (Ubuntu, might change in the future) and I've been trying to make as much work this way as possible. So, I decided to try getting WinAGI to work in Wine. (Well, again I guess, but more seriously this time.)
First off, when you run it you'll get an error about missing MSFLXGRD.OCX. To fix it, you'll need to install msflxgrd with winetricks. The VB6 runtime might be needed too, I had it installed prior because I thought it was the culprit.
Picture, View, and Sound editors all appear to work from a cursory look, I was able to compile and build the template game, and it ran fine in ScummVM. However,
Minor problem: the splash screen displayed black.
Much more major: trying to open the code editor crashes WinAGI. I guess something about it disagrees with Wine. Of course, trying to make an AGI game without being able to edit the logic would be rather difficult!
(I also couldn't get MIDI playback of Sounds to work, but I think there might be a way to make MIDI playback work in Wine.)
(I know, this probably isn't even worth figuring out WHY it doesn't work, let alone fixing.)