Can't install existing virtual hard drive

[JapanDan]

Hello there,
I am trying to install an existing virtual hard drive which is a vmdk file. However I got the following error. Any help would be greatly appreciated.

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Failed to open the hard disk file C:\Users\whatever\Downloads\testing\OWASP_Broken_Web_Apps_VM_1.1.1.7z.

Could not get the storage format of the medium 'C:\Users\whatever\Downloads\testing\OWASP_Broken_Web_Apps_VM_1.1.1.7z' (VERR_NOT_SUPPORTED).

Result Code: VBOX_E_IPRT_ERROR (0x80BB0005)
Component: Medium
Interface: IMedium {05f2bbb6-a3a6-4fb9-9b49-6d0dda7142ac}
Callee: IVirtualBox {fafa4e17-1ee2-4905-a10e-fe7c18bf5554}
Callee RC: VBOX_E_OBJECT_NOT_FOUND (0x80BB0001)

[mpack]

As the error message says, what you have there is a ".7z" file, not a VMDK. I assume you probably need to decompress it first.

And, since it calls itself a VM rather than just a disk, I assume what you'll find inside is an OVA or OVF appliance which you need to import into VirtualBox using File|Import....

Note: if you find an OVF plus a VMDK then you must not attempt to use the VMDK directly, because it will be compressed as well. You must use the import feature.

[JapanDan]

Thanks Mpack,
I've just never seen that compressed file format before.