http://www.thenexusforums.com/index.php?/topic/249603-faqs/
What's this ArchiveInvalidation file I'm hearing about?
This file is a list of textures, meshes, sounds that override the originals from the .bsa files. It's a text file that resides in the installation directory (see above), you have to manually create this file each time you add or remove textures, etc.
That said, there is an easier way. The ArchiveInvalidationInvalidated!.bsa technique does work. You just have to manually add it.
Steps:
ETC ETC its in the faq