I run Windows XP in a Virtual Box on my Ubuntu 14.04 laptop. I've set the shared folder access so I can access (read and write) the files on my ext4 /home partition.
However, I've often wondered how this set up works. To my knowledge, Windows cannot access an ext4 filesystem natively, and even with additional programs, only reading an ext4 partition is considered "safe". So how does the VirtualBox integrate ext4 access to Windows XP so seamlessly?