Can't run an ova file I download virtual box from http://www.modern.ie/en-US/virtualization-tools#downloads and extracted it. When I tried to run ova file, I couldn't.

$ sudo ./"IE11 - Win8.1.ova"
./IE11 - Win8.1.ova: ./IE11 - Win8.1.ova: cannot execute binary file

$ ./"IE11 - Win8.1.ova"
-bash: ./IE11 - Win8.1.ova: cannot execute binary file

$ ls -l "IE11 - Win8.1.ova"
-rwx------  1 alex  staff  3834711040 Mar 28 15:02 IE11 - Win8.1.ova


The same failure from Finder, it said 

There is no application set to open the document “IE11 - Win8.1.ova”.
You can't run .ova files from Terminal as they are not a binary file, hence the error. ova files are for VirtualBox, so you need VirtualBox to be able to open the file. Download VirtualBox from virtualbox.org.