Good to hear that you are working now. It's interesting that there are differences in that file. I've compared my own Windows copy with the Mac version and I get the same list of differences. It looks as if the Mac v3.19 patch didn't include a Firaxis change in the Windows version. I don't see the point of that Steam change. /Applications, ~/Documents, and ~/Library/Application Support are all included in Time Machine backups, unless you deliberately exclude them. I'd have thought that would be what you want to happen so that you can restore a full system config from backup. And they shouldn't add "GBytes of backup data", as app files shouldn't change often. In any case, MacAssetsCheck should still find the Civ4 folder, wherever they put it, as it now asks the OS for the locations of any of the Civ4, Warlords or BtS applications. It can then find the rest of the folder structure. OS X should have detected, or been notified of, the installation, and it should report at least one of their locations.