It sounds to me exactly as stated above, that you're trying to open them from Winzip or a similar program instead of unzipping them into the Morrowind Data directory first (sort of like trying to run an .exe program without installing it first).
Follow the directions for each plugin (where to unzip).
Then open TES, select the file and click on Set as Active. Let the file load, save again, and repeat for each mod.
[ 02-06-2003, 12:21 PM: Message edited by: Rhea ]
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