I believe latest version but it's a bit of a blurr as I've added dark gui etc. on top. But this command should reside either in native program files or %appdata%

C:\Program Files\MoI 4.0 beta Feb-27-2019\..

I find the following using search of *imp*

Import.js
ImportPart.js
ImportSubD.js

%appdata%\Roaming\Moi\..

I find the following using search of *imp*

_ImportObj.js (which is v.1.5)