MIDL2395
The documentation lists this name without a value.
Documented in Win32
type or construct not supported in a library block because Oleaut32.dll support for 64-KB polymorphic types is missing OLE automation does not support polymorphic types (such as _int3264, INT_PTR, etc). These types have incompatible data representations between 32-bit and 64-bit platforms. The remote call will fail at run time on 64-bit platforms. Note: Note that as of Windows 2000 release, 64-bit TLB files are supported by OLE Automation by converting 32-bit TLB information at run time. Therefore, only 32-bit TLB generation is supported by MIDL. If MIDL is being used just to generate a header file, the /notlb switch will suppress generation of the TLB file.