File Extension VDI File Format VirtualBox Virtual Disk Image VDI stands for VirtualBox Virtual Disk Image. This was last updated in March 2012 By Margaret Rouse Browse File Extensions Alphabetically: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # Ask a Question. Find an Answer. Ask your peers a question about this file extension. Ask a Question Managing a PC estate Saving / Running EC2 instance image on VirtualBox On a virtual machine, can you download/install files, programs, and applications from the Internet?