Ok, I should have been more specific. Sorry about that. Let's first say, I've read Tomlong's page, and I do use BAIN.
A Bethesda Softworks Archive (BSA) is a type of compressed file format in which Oblivion packs away many of its files. They reduce clutter and allow the game to find files more easily. For that reason, a number of people recommend BSA repacking. This introduces a new dynamic when installing lose files, especially replacers. The game looks through the BSAs first and the <<<--- Typo? then
looks for newer loose data files. If you install a mod containing files that are dated earlier than the BSA containing files that it overlaps with, the game will still load the files in the BSAs unless you use archive invalidation.
The way I understand this is as follows. Provided I have ArchiveInvalidationInvalidated!.bsa, Oblivions first scans all .bsa files. (I am assuming from oldest to newest.) Then it checks the /meshes, /textures, etc. folders. Now, whenever there is a file in the folders as well as in the .bsa Oblivion takes the file from the folders. Am I correct so far?
Speaking in BAIN - language, this means that I have the bsa - Files very early in my install-order, that is definitely before any package that I install using BAIN.
Now redating .bsa files would simply change the order the content inside the .bsa files gets read, but not affect the files inside the /meshes, /textures, etc. folders. And as far as I understand this is even independent of the install method (Manual, OBMM, BAIN).
I'm bringing all this up, because I want to install the new test-.bsa files without a complete re-install of FCOM. Hope this time I'm more clear on my problem(s).