.VMSS File Extension
File TypeVMware Suspended State File
What is a VMSS file?
File created by VMware virtualization software; saves the state of the virtual machine (VM) when it is in a suspended state, meaning that it has been stopped temporarily; used for resuming the VM from where it was stopped; created automatically by the software when the VM is suspended.
The suspended state allows VMs to be stopped and deallocated from using system resources. This is helpful because users that have multiple VMs can switch between them without overloading the system.