This folder is the place where you can save baseball cards for certain persons. Whenever a historical league finishes a full year, OOTP will check this folder and search for baseball cards for players and coaches. OOTP will search fo file names with a certain format:

<first name>_<last name>_<year>_<suffix>.png

For example joe_smith_2001_my_bbcards_collection.png

If there are spaces or dots in the names, they must be removed. File names should be in lower case.