The race_feat_*.2da files are the .2da files that list the feats automatically given to characters of a given race. For player characters, this is done at character creation; for non-player characters, this is done when a new creature blueprint is created from scratch in the Toolset (rather than starting with a copy of an existing blueprint). These files are used only when referred to by the "FeatsTable" column of racialtypes.2da.