While there isn't a single official "proper feature" file by that exact name, you are likely looking for either the or a community-made squad file to keep the aging FIFA 23 rosters current (e.g., with 2025/26 transfers). 1. Official In-Game Update (Recommended first step)
In-game, go to > Profile > Load Squads and select your new file. 3. Important Features of Modern Updates Datei herunterladen FIFA 23 Winter Squad Update...
: Newly added youth players not in the original game. While there isn't a single official "proper feature"