Unable to Register 32 bit Plugin Assemblies in Microsoft Dynamics CRM 2011

When attempting to register a 32bit plugin assembly in a Microsoft Dynamics CRM 2011 deployment, users may encounter the following error:

"Unable to load the specified plug-in assembly"

If one enables platform tracing within Microsoft Dynamics CRM, additional information is provided:

Unhandled Exception: System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Crm.Sdk, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
   at System.Reflection.Assembly._GetExportedTypes()
   at PluginRegistrationTool.AssemblyReader.RetrievePluginsFromAssembly(String path) in C:\Users\administrator.DDCRM\Desktop\PluginRegistration 2.2\AssemblyReader.cs:line 59
   at PluginRegistrationTool.AssemblyReader.RetrievePluginsFromAssembly(String path)
   at PluginRegistrationTool.RegistrationHelper.RetrievePluginsFromAssembly(String pathToAssembly) in C:\Users\administrator.DDCRM\Desktop\PluginRegistration 2.2\RegistrationHelper.cs:line 49
   at PluginRegistrationTool.PluginRegistrationForm.btnLoadAssembly_Click(Object sender, EventArgs e) in C:\Users\administrator.DDCRM\Desktop\PluginRegistration 2.2\PluginRegistrationForm.cs:line 127

Symptoms

This issue is caused by the bitness of the assembly being registered.  There is a restriction with any 32bit plugin assembly where they have to be registered in Microsoft Dynamics CRM 2011 using a x86 version of the plugin registration tool.  This is documented in the Microsoft Dynamics CRM 2011 SDK but the documentation fails to mention that this restriction applies to any pre-existing Microsoft Dynamics CRM 4.0 plugin assemblies as well.

Cause

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