[ubuntu] How to open .ova file in Virtualbox 4.2.12 (ubuntu)

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http://ubuntuforums.org – Hi, I am using Ubuntu 12.10 64 bit OS. One of my colleague has provided me with a .ova file to use it in virtualbox. I am trying to add it in storage options of a instance, But am unable to add it, i am getting a error - Failed to open the hard disk /home/anand/softwares/Openbravo [openbravo_x86_64].ova. Could not get the storage format of the medium '/home/anand/softwares/Openbravo [openbravo_x86_64].ova' (VERR_NOT_SUPPORTED). Any help will be appreciated. Thanks!! (Hardware)