The string likely refers to the Cisco NX-OSv 9000 Go to product viewer dialog for this item.
The 7.0(3)I7 train is (EOL since 2020). For new learning, start with 10.3(x) – though resource requirements are higher (12GB RAM recommended).
Here’s a helpful, balanced review for the file (which appears to be a Cisco Nexus 9000v virtual switch image for QEMU/KVM):
You can often get the exact software version by unpacking the QCOW2 or booting it once. However, based on naming convention alone, this very likely corresponds to: