A: mdb (all versions: 4.x, 3.x, 2.0, 1.1, 1.0), accdb. See jet help
for the latest info.
A: Yes, --db-format [jet3x / jet20 / ...]
.
A: Yes, but not its extended features. You can do everything you can do with MDB.
Q: I'm getting "provider not found" (0x800A0E7A) or "database not supported" errors with .accdb files.
A: To access accdb databases you need ACE.OLEDB provider 12.0 and DAO.Engine.120. It's installed with Office 2010 and later. See here for details.
A: x64 version needs DAO.Engine.120 even for MDB databases.