Question: Can I transfer my OS X Divinity: Original Sin save files to the Windows version of that game?
Answer: Yes. Save files for Divinity: Original Sin are cross-platform. You can simply copy the contents of your Savegames folder between the OS X and Windows versions.
Notes: The save files for Divinity: Original Sin are located in the following folders:
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Windows: \[your user account name]\Documents\Larian Studios\Divinity Original Sin\Savegames
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OS X: /Documents/Larian Studios/Divinity Original Sin/PlayerProfiles/[your user account ID]/Savegames