How do I set the EDITOR variable properly in Windows?

[lucas-yotsui]

I've used Walk in my Linux install for a while now and it works flawlessly. Just today I realized that I could use it on Windows too and installation was very smooth until I hit this bump: I don't know how to do something like this shell command "export EDITOR=hx" in Powershell. Here's what I've tried putting in my $PROFILE script so far:
$Env:EDITOR='hx.exe'
$Env:EDITOR=hx.exe
$Env:EDITOR=hx
None of which have worked (I didn't put them all at once, those were three different attempts)
Does anyone know how to set this properly in Windows? It's really the only missing piece in my whole terminal setup.