.qcow2 only can be open using Virt-Manager.

Other i don't know.

qcow2 is a file for copy-on-write disk.

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Install requirement

1. Install  qemu-system
$ sudo apt-get install qemu

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2. install 
$ sudo apt-get install libvirt-bin

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run Virt-Manager

3. Run Virt-Manager

$ virt-manager

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Run .qcow2 file

4. We need to select "import existing disk image" to select .qcow2 file
Click icon at top left (Monitor with play button) --> Import existing disk image --> Browse... --> Browse Local --> select .qcow2 file --> Choose ur OS Type.

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5. Configure VM

Choose ur RAM and CPU base on ur needed. --> Network selection --> Host device eth0 --> Source mode: Bridge --> Finish.

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6. Getting IP Address

$ sudo ifconfig -A

*This will list the network adapter

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7. Take IP Address from DHCP

$ sudo dhclient eth0

*This will request an IP Adress from DHCP

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8. Ping google.com

$ ping google.com

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Done.

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