Kingdom Hearts Birth By Sleep - ARC format
The ARC format (presumability a shorten of Archive) is a container of files with a dependency system feature to other files in a BBSA archive.
RESERVED fields are used by BBS engine to store a pointer to the data.
Right after the header, an array of entry is found.
An entry can represents either a file contained in the archive or a file the archive depends on.
When the file exists in the archive,
Directory hash is
When the entry is a link to anotehr file,
Directory hash has a value and
Offset value is ignored.
Apparently the file
arc/menu/01_race.arc from Birth By Sleep is corrupt and unreadable. It is unknown if the remastered actually uses that file; and if yes, how.