Mount a VHD (VirtualBox) in OSX

There is an app for that: Paragon Virtual Disk Mounter. Beta version is available here: http://www.paragon-software.com/support/betatesting/vd-mounter-mac-beta/index.html

.vhd, .vmdk, .vdi are supported at the moment.

Install the MacFUSE version from here: http://www.matthewratzloff.com/blog/2012/03/12/macfusion-on-os-x-lion/

Then, install the newest MacFusion App from here: http://macfusionapp.org/

This utilizes the existing SFTP abilities and achieves the same goal. Only way I found, and I've been looking for days!