png format and 'thumbnail.png' name dimensions aren't important but should be 1:1 ratio) Mod picture (optional) - a file named thumbnail.png in the mod folder, to serve as Steam Workshop mod picture (Note: Must use.mod file (Note: The File must use the descriptor.mod name and must NOT be saved in UTF-8 BOM format) descriptor.mod file inside the mod folder - this file should contain the same information as the first.The mod data must have the same file and folder structure as the game's directory itself. The mod folder or zip containing the mod data.The '.mod' file, to tell the launcher what to do with the mod-folder (For local use only, any name possible this file does not get uploaded, when publishing the mod via Steam Workshop).Local Mod files must be located in the folder ~/.local/share/Paradox Interactive/Hearts of Iron IV/mod or C:\Users\\Documents\Paradox Interactive\Hearts of Iron IV\mod, which must contain:
