Welcome to the Community,
It's still the .vmx file which contains the configuration data. The .vmxf file only holds some additional metadata.
If the VM works, there's got to be a .vmx file somewhere.
Please let us know the product so we can reroute as necessary. But in general, .vmx files are always with the VM files whereever they are located, however, it is possible to have 'stragglers' after a vMotion on ESXi. Look inside vCenter to find the proper location of your VM. If Workstation or Fusion, they are always with the VM.
Edward L. Haletky
vExpert 2009-2017, Community Moderator.