Excel.exe convert into Excel.dll in .NET

http://lists.ironpython.com/pipermail/users-ironpython.com/2006-February/001736.html

C:\...\>IronPython-1.0-Beta2>tlbimp /out:excel.dll "C:\Program Files\Microsoft Office\OFFICE11\EXCEL.EXE"
>Microsoft (R) .NET Framework Type Library to Assembly Converter 2.0.50727.42
>Copyright (C) Microsoft Corporation.  All rights reserved.