Cannot convert xml file

Hello guys,

At start I’m new in Powershell and I have a little problem with processing xml file. I try open Virtualbox.xml file

[xml]$xml = Get-Command c:\VirtualBox.xml

and receive that error.

Cannot convert value "VirtualBox.xml" to type "System.Xml.XmlDocument". Error: "Data at the root level is invalid. Line
 1, position 1."
At line:1 char:10
+ [xml]$xml <<<<  = Get-Command c:\VirtualBox.xml
    + CategoryInfo          : MetadataError: (:) [], ArgumentTransformationMetadataException
    + FullyQualifiedErrorId : RuntimeException

Peter