For qemu you just issue qemu -hda filename or some such command. Maybe -hd0
I tend to use some gui.
The file you have is a raw file hopefully of some entire drive. It is quite readable by qemu.
It may be possible that you can simply mount the image by a loop or fuse or other way.
You would have to get close to the original system such as arm or what not. It may not work if the virtual system is too far off.