vmrun opens .vmx files in the default application instead of Fusion

This is an attempt at a bug report. Please let me know if there's a better place for this.

If any application other than Fusion is set as the default application for .vmx files, vmrun will open the .vmx file in that application instead of starting the VM in Fusion.

Steps to reproduce:

1. Right-click any .vmx file.
2. Under "Open with:" select any application other than VMware Fusion, such as a text editor.
3. Click "Change All...".
4. In the terminal, run `/Applications/VMware Fusion.app/Contents/Library/vmrun -T fusion start /path/to/my/vm.vmx gui`

Expected behavior:

The VM starts in Fusion.

Actual behavior:

The VM is not started. Instead, the .vmx file is opened in whatever application was chosen in step 2 (a text editor in my case). vmrun hangs, seemingly forever.

System Info

macOS 10.13.4

VMware Fusion 10.1.2