Understanding the filename helps verify you have the correct software for your needs.
qcow2: This is the file format (QEMU Copy On Write version 2). This is critical because it tells you which virtualization platforms are supported. QCOW2 is the native format for KVM (Kernel-based Virtual Machine) and QEMU based hypervisors.Cisco does provide a virtual Catalyst 9000v (for CSR1000v-like platforms, but note: the real Cat9k switch is not widely available as a virtual appliance for non-partners). More common is the Cisco IOSv or IOSvL2 for switching.
However, community-driven conversions exist. A real converted qcow2 filename might look like:
None match prd171201prd9.
Do not run it until you verify.
If your goal is network emulation, follow these steps legally: