I'm having the same issue on my PC. It runs multiple OSes and I'd like to share the Steam library. I've settled for Ext4FS, which works on all the Linux distributions, but not on Windows. I wonder, has anyone tried to get this to work? There's at least 3 options: Ext4FS (Ext3/Ext2), NTFS, and Btrfs (which has a Windows driver as well).
