Some files are not registered, so mssql table files cannot be opened.

Use Regsvr 32. exe and then register the following DLL:
C: \ Program files \ Common Files \ System \ ADO \ Msado15.dll C: \ Program files \ Common Files \ System \ Ole Db \ Oledb32.dll C: \ Program files \ Common Files \ System \ Ole Db \ Sqloledb. dllC: \ WINNT \ System32 \ Atl. dll cannot be directly registered in "run" during registration. You must locate the dll in the Dos status by running cmd.
If a directory exists, register cmd → cd C: \ Program files \ Common Files \ System \ → regsvr32 Msado15.dll. At this time, a dialog box Indicating successful registration is displayed, which is generally used for registration:

Regsvr32/u Msado15.dll