What are these: s_ColLineage, s_Generation, s_GUID and s_Lineage columns in table?

I have been asked to modernize an older access database and noticed that
some (but not all, and none that I have created) of the table have extra
fields/columns: s_ColLineage, s_Generation, s_GUID and s_Lineage, even
though under Tools, Option, neither of the options to show hidden or system
objects is checked.
One of my updates was to split the database, but when I open the table in
the new back end these fields are not visible, but from the front end link
they still are. I had been planning to remove these fields, thinking they
were relics from an older version, but they must be system data of some
kind.
Can anyone tell me about them, and why I can see them from the FE but not
the BE?
Mich