This feature will be removed in a future version of Microsoft SQL Server. Do not use this feature in new development work, and modify applications that currently use this feature as soon as possible. Use CLR Integration instead.
To drop each extended stored procedure function in a user-defined extended stored procedure DLL, a SQL Server system administrator must run the sp_dropextendedproc system stored procedure, specifying the name of the function and the name of the DLL in which that function resides. For example, this command removes the function xp_hello, located in a DLL named xp_hello.dll, from SQL Server:
Beginning with SQL Server 2005, sp_dropextendedproc does not drop system extended stored procedures. Instead, the system administrator should deny EXECUTE permission on the extended stored procedure to the public role.