Is there a native one? Or something in Java?

I've been trying to get MooseEdit working in Wine. I've got Wineskin 2.6.0 and the engine is WS9Wine1.7.29. When it starts up it shows

C:\users\Bob\My Documents\Larian Studios\Divinity Original Sin\PlayerProfiles\

in the Player Profiles Folder and lists all the correct save game file names by profile folder and name, as in Test\Test Save.

Initially I had nothing in the Game Data Folder and I got a warning about Main.pak. So I added this

C:\Users\Bob\Library\Application Support\Steam\SteamApps\common\Divinity - Original Sin\Divinity - Original Sin.app\Contents\Data\

When I select a save game, it starts loading and then aborts.

I also tried the native OS X path as

/Users/Bob/Library/Application Support/Steam/SteamApps/common/Divinity - Original Sin/Divinity - Original Sin.app/Contents/Data/

What am I missing?

Thanks