Can a Parallels VM be salvaged from a recovered .hds file (200gb file)?
It's possible that just the partition table got trashed somehow, use TestDisk to re-write the partition table:


  TestDisk is powerful free data recovery software! It was primarily designed to help recover lost partitions and/or make non-booting disks bootable again when these symptoms are caused by faulty software: certain types of viruses or human error (such as accidentally deleting a Partition Table). Partition table recovery using TestDisk is really easy.


Attach the virtual drive to another VM and use TestDisk from there.

This Parallel's support article describes the process, Unmountable boot volume BSOD when you start Windows virtual machine.