The string refers to a specific FortiGate VM image for the KVM hypervisor, specifically FortiOS version 7.4.7, build 2731 .

virtual appliance image designed for KVM (Kernel-based Virtual Machine) environments. Breakdown of the Filename : FortiGate (the product). : 64-bit Virtual Machine for the KVM hypervisor. : Version 7.4.7 of the FortiOS operating system. : The specific software build number. : The manufacturer. out.kvm.qcow2

Short filename (sanitized): fgtvm64kvmv747m_build2731_fortinet_out_kvm.qcow2

diagnose sys top 5 from CLI, or diag test application sshd 1

: Indicates the FortiGate VM for 64-bit architecture. kvm : Specifies the KVM hypervisor as the target platform.

So your search keyword likely lacks hyphens and contains a typo ( v747m instead of v747-M ). Try searching for: FGT_VM64_KVM-v7.4.7-build2731-FORTINET.out.kvm.qcow2