I'm trying to create a Virtualbox image of windows 8 consumer preview. I tried this tutorial: http://www.addictivetips.com/windows-tips/how-to-install-windows-8-on-virtualbox/
I did exactly what was said in that tutorial. At the step "Now navigate to the Windows 8 developer build ISO file that you downloaded and select it." I get the error "Could not get the storage format. (VERR_NOT_SUPPORTED)". I also get this if I use the regular wizard.
Host OS: windows 7 Virtualbox version: 4.1.14
Both windows 8 64 bit and 32 bit tested.
EDIT: tested on Virtualbox version 4.1.16, the error still occured.