Modding Legacy Files

1. Open folder where you have installer your game.
2. From there navigate to LiveEditorMods\root\Legacy (If you don't have these folders then create them). This is equivalent of the FIFA->Legacy Viewer in frosty.
3. To add or replace files you just need to recreate the path to the file in LiveEditorMods\root\Legacy.

How to add/replace miniface

Tutorial by @Soup

You need to know what is the playerid. File format must be exactly the same as game uses (DDS)-> BC3 (Linear, DXT5) and miniface size must be 180x180. For example, if you want to add face for Dino Visser (ID: 256318) then put the miniface in LiveEditorMods\root\Legacy\data\ui\imgAssets\heads and name it p256318.DDS.

Once you done that you should be able to see new miniface in game, as on this video:

https://youtu.be/2TeT1HLX55U