VMDK file extension

This is a virtual disk file, which stores the contents of the virtual machine's hard disk drive.

A virtual disk is made up of one or more .vmdk files. If you have specified that the virtual disk should be split into 2GB chunks, the number of .vmdk files depends on the size of the virtual disk. As data is added to a virtual disk, the .vmdk files grow in size, to a maximum of 2GB each. (If you specify that all space should be allocated when you create the disk, these files start at the maximum size and do not grow.) Almost all of a .vmdk file's content is the virtual machine's data, with a small portion allotted to virtual machine overhead.

If the virtual machine is connected directly to a physical disk, rather than to a virtual disk, the .vmdk file stores information about the partitions the virtual machine is allowed to access.
Earlier VMware products used the extension .dsk for virtual disk files.

How to open VMDK files:

The native application, that can open the VMDK VMWare virtual disk file is VMware Workstation. Another compatible application is VirtualBox.

How to convert file with extension VMDK:

There is no way to convert VMDK VMware virtual disk file to another disk image format.

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VMDK in WikiPedia

VMDK in Google.com