Mount VDI image on windows, VirtualBox

I really want to mount any type of VirtualBox disk image with some kind of free tools.

The best way i find out today (which is not really solution) is to convert VDI file to to RAW image.
Then open the file with 7-zip or daemon tools.

To convert to RAW image you need as much free space as big is your file system inside in vdi file.
For Example this is 40GB hard disk which takes only 5GB on disk.
You can get this information with VBoxManage showhdinfo image-file.vdi:

Now you need 40GB for img file, pretty nice hdd write speed and, of course, time to get the job done.

To enter this solution use:

VBoxManage clonehd --format RAW input-image.vdi output-image.img

If the destination drive has not enough space you get error instantly.

Be accurate when next time choose size of additional hard drive.