How To: 'Reverse engineer a .net application?'

With Reflector you can revert the CIL to .net code with the help of an reflector add-in by Denis Bauer: http://www.denisbauer.com/NETTools/FileDisassembler.aspx

This add-in allows you to generate a .net project.
Only a designer file isn't generated. The Designer code is merged in the code-behind form class file.