@Nenad A. @Blup Blup I just tested a change to the Mac version that I think will allow a combo Windows/Mac (and possibly Linux) version.
Short version:
Make config.ini in an empty app a link to a Mac specific config.ini, and in that change the FILE line to
FILE = "../../../Adventures Of Willy D 0.21.vis"
Visionaire Player will find all the assets correctly outside the Mac app. So all you'd have to do to get a working Mac version is add this app and "mac config.ini" to the Windows version.
Long version:
I moved the assets from app/Contents/Resources to the directory that the app was in.
I copied config.ini to mac config.ini.
I changed the FILE line to FILE = "../../../Adventures Of Willy D 0.21.vis"
I made a symlink in app/Contents/Resources called config.ini pointing to mac config.ini
Double click on the app, and it runs the game. I tested this by downloading the Windows version, then dropping the app and config file in the Windows folder and running. It launched correctly and I could start a new game.
Attached is the Mac config file. I tried to attach the mac app, but I got an error. So I uploaded it to my Mega drive:
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Nenad, feel free to distribute this instead of making a Mac version. This app can be used for future versions, until you update to a new version of the player. Just change mac config.ini to point to the correct .vis file.