Mod files in arz format instead of zip?

Hello, just wondering why my mod download files from nexus mods are in zip format but when my friend download the files from his pc it’s in arz format? I gave him detailed steps to install the mod but. The files are arz and I’ve never dealt with a file like that before and can’t find a lot of info on it. Any help would be great. The mod in question is smash and grab unchained

arz is the grim dawn file for the game data
you just need to plop it in the mod folder, either under mod folder name or as a hard mod

Thanks, didn’t know it was that easy.

If the downloaded file is smash and grab.arz, then the correct usage should be as follows:

  1. Create a subdirectory named smash and grab in Grim Dawn\mods,
  2. Enter it and create a subdirectory database, then copy smash and grab.arz into it, and you can start playing as a normal custom mod.
    After all the steps are completed, the full path is as follows:
    Grim Dawn\mods\smash and grab\database\smash and grab.arz