External Stored Procedure in SQL Server 2005(x64)

I have generated a DLL file in VC++ 2005 by a 'C' file. It works fine when I put in a 32bits machine(32bits Windows Server 2003 + 32 bits SQL Server 2005).

However, when I build it into 64 bits, it doesn't work in a 64 bits machine. I have checked by Dependenct Walker, the DLL generated is linked with KERNEL32.DLL / OPENDS60.DLL / MSVCR80D.DLL, all of these DLL files are on the 64 bits machines and linked correctly.

I used the command

sp_addextendedproc 'abc', 'C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Binn\abc.dll'

to create a ext. stored procedure. When I run it, the error message shows that

Could not load the DLL C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Binn\abc.dll, or one of the DLLs it references. Reason: 126(error not found).

I would like to ask what is cause of the problem? Do I need to use CLR instead?

Thank you very much!!~

BTW, it is because of your thread I posted the "32Bit Vs 64Bit" SQLCLR platform differences thread. If there are any definite differences this would be a great addition to my upcoming book. Have you experienced any other problems on 64bit platform for sqlclr?

thanks,

derek