These two cannot be deleted, otherwise they cannot be used. If the LDF file is too large, that is, the log file is too large and needs to be deleted, the database should be separated first and then renamed as *. LDF, such as * 1. LDF, and then attach it again, and a new log file will be created. Only in this way can you delete this * 1.LDF.
If it is accessed, it cannot be deleted. Because there is only one file. *.MDB
If it is from Oracle Bone Inscriptions, it cannot be operated in the system, so you need to run the DOS command.