A Virtual Machine Disk (VMDK) file that contains the operating system and pre-installed QRadar software for testing and development.

While native to VMware, this disk format is widely supported by VirtualBox and QEMU . Common Use Cases & Conversions

VMDK files are generally considered faster than standard VHD formats in unofficial benchmarks and support incremental backups, making them a "good piece" of tech for virtualized lab environments.

Are you trying to this disk for a specific platform, or are you having trouble booting it? HowTo: Qradar CE 7.3.3 v1.0 GA to Azure image | IBM QRadar

Users often modify or convert this specific disk to run QRadar in different virtual environments:

It is frequently converted to the .qcow2 format to improve performance on KVM-based hypervisors.

qemu-img convert -f vmdk -O vhdx QCE-jan22-disk1.vmdk QCE-jan22-disk1.vhdx .