Sometimes it is necessary to have access to the Nintex Workflow/Forms assemblies (Developing custom actions for example). The files reside in the GAC (Global Assembly Cache). By default, files in this location are not very easy to get to. A quick way to get to the assemblies is to use the subst command. Example: subst g: c:\windows\assembly would attach the GAC folder to a driver letter of g:
Once you have mounted the GAC, you will find the Nintex Assemblies in the GAC_MSIL (Microsoft Intermediate Language) folder as illustrated above.