SQL Server recovery system stored procedure operations seem case sensitive

Because of the security of the database server, the extended stored procedure of the xp_regread system was previously deleted, because it is still unavailable after recovery.

The recovery statement used is:
Use master
DBCC addextendedproc ("xp_regread", "xpstar. dll ")
Go

It seems that there is no error, but the xp_regread process still cannot be used. Although the stored procedure can be seen in the Enterprise Manager, it cannot be used and the prompt cannot be found, which is a blind spot. Later, the xp_regread in the recovery statement was changed to xp_regread.

In this case, the stored procedure names used in the recovery statement are case-sensitive, but are case-insensitive after recovery. Actually fainted.