One point of confusion to me remains wrt the mods out there described as replacers, such as for textures and meshes.
For example, the info at PES about Vibrant Morrowind 4.0 warns "This will replace most of your game textures.
Please make a back up copy of your textures folder first". I take it to mean that it will overwrite the game's
files (those in Morrowind\Data Files). And the info about its update "ver 4.0 update" notes that there is no esp.
A mod cannot overwrite Morrowind's base textures or meshes, because those are stored only in Morrowind.bsa. What a "replacer" mod does is provide loose files for those things it wants to replace, and the game uses loose files in preference to the .bsa if loose files exist.
The reason such mods warn you to back up your textures folder is that they might overwrite
other replacers you have installed. If you were to then decide you liked the old replacer better, you could not go back to it without reinstalling it or reverting to the backup folder. Reverting to plain Morrowind is always easy; just get rid of all those loose textures and meshes, and the game will again read the original files from Morrowind.bsa.
Wrye Mash Installers means you don't have to worry about this, as I will explain:
Let us suppose you have two texture-replacing mods:
- Mod 1: replaces textures A and B
- Mod 2: replaces textures B and C
Suppose you use Wrye Mash Installers to install Mod 1. Now your Morrowind uses textures 1A and 1B in place of A and B. If, at this point, you use Wrye Mash Installers to uninstall Mod 1, it deletes textures 1A and 1B, and you are back to default. In game you will see the original Morrowind A and B again, because without any loose textures, the game reads them from Morrowind.bsa.
Suppose, however, you use Wrye Mash Installers to install Mod 1 and then Mod 2. Now your Morrowind uses textures 1A, 2B, and 2C in place of A, B, and C -- since your install order was Mod 1 and then Mod 2, you are using the B texture from Mod 2. Wrye Mash doesn't really make a backup of texture 1B. But -- if you now use Wrye Mash Installers to uninstall Mod 2, and have Auto-Annealing on, Wyre Mash is smart enough to first uninstall the 2B and 2C textures, and then
re-install the 1B texture since you still have Mod 1 installed. So it is as if you only ever installed Mod 1. The great thing is that you don't have to remember to re-install texture 1B yourself; it is done automatically.
So basically, Wrye Mash Installers frees you from the worry of having to remember which files went with which mods, and just takes care of all the clean-up for you.
Btw, the word "installing" in this context seems misleading. Wrt mlox, I don't see that type of mod showing up in
the list it generates, I guess because it does not have an esm/esp file in the "Data Files" folder for either mlox
or the game to recognize. I don't know if it would show up in Wrye Mash's installer screen either; I'll have to
test that. FWIW, I do have a backup copy of the data files folder made immediately after I had installed the game
(GOTY meaning it has the official patches) but once burned, twice shy.
You're right; pure "esp-less" mods don't show up in mlox exactly because they don't have an .esp or .esm. In fact, even mods which have an .esp or .esm installed in your Data Files folder, but which you have not checked off to load in your game, will not show up in mlox.
Think of install to mean "put the files where Morrowind can see them", not necessarily "check off the checkbox for an .esp".
Such mods
do show up in Wrye Mash's Installer tab, however. It does not care what is loaded into your game; any mod that you put in the Morrowind/Installers folder (or Mods folder as this tutorial recommends) will show up in the Installers tab.