Find all vmx file in a datastore


I have a datastore with a unregister vm(so far i don't know the vm name)
I want to find it and get file name then register.

but I can't find how to achieve far I can't find a way to list all file in datastore...

I'd like to know how to collect all file in datastore like below
When I can get vmx file and I can register it..

- .ssd.sf
- .eui.23693...
- UbuntuVM(which is my unregister vm)
- UbuntuVM.vmsd
- UbuntuVM.nvram
- UbuntuVM.vmx