Where at Microsoft are the instructions for that NT registry patch we need for installing WinAppxD?

As documented in the installation instructions, see the following URL for instructions on the registry modification to avoid USER32.DLL initialization errors:

http://support.microsoft.com/support/kb/articles/q142/6/76.asp


   NOTE ABOUT URL's:  Microsoft periodically rearranges its web
   site, so the above URL may or may not be valid.  If you can't
   find it, use the "Search" option on the MS web site, instructing
   it to look in whatever choice includes the "Knowledge Base".
   Specify "Qnnnnnn" as what to look for, where nnnnnn is the number
   between the "q" and the ".asp".  For example, in the above, it
   would be Q148367.  That should enable you to locate the article.