Hello there,
I recently decided to replay Morrowind, with all of the fancy new mods and texture replacements.
However, I noticed that some of the textures stay the way they were in Vanilla, despite the fact that I placed replacements into the /Textures folder.
More specifically, lately I've been trying to replace Hlaalu buildings textures with high res ones. (Tx_hlaalu_ceiling.dds and so on)
I firmly placed them inside the C:\Program Files (x86)\Steam\steamapps\common\morrowind\Data Files\Textures folder. And the textures in Balmora stay the same as in Vanilla when I start the game. I am very confused about what to do.

Thank you for any tips and suggestions!

Have you redated your .bsas to 2002? From what I've read, that's the cause of some textures not changing for the Steam version. http://tes.nexusmods.com/downloads/file.php?id=19510 will automatically redate them for you upon installation.

That did the trick. Everything looks so much better now!

Thanks a lot.