static extern int LoadTypeLib(string fileName, out ITypeLib typeLib);

Declare Unicode Function LoadTypeLib Lib "oleaut32.dll" (ByVal szFile As String, ByRef TPpTypeLib As System.Runtime.InteropServices.ComTypes.ITypeLib) As Integer

Declare Function LoadTypeLib Lib "oleaut32.dll" (szFile As Byte, pTLB As Object) As Long

For backward compatibility, LoadTypeLib will register the type library if the path is not specified in the szFile parameter. LoadTypeLib will not register the type library if the path of the type library is specified. It is recommended that RegisterTypeLib be used to register a type library.

Ensure that you use the same parameter type in LoadTypeLib in either language.

    Private Declare Unicode Function LoadTypeLib Lib "oleaut32.dll" (ByVal TLpszModule As String, ByRef TPpTypeLib As ComTypes.ITypeLib2) As Integer

            nResult = LoadTypeLib(strFile, TLB)