Tips: Register BSAs
When a mod comes with a
.bsa file (such as Tamriel Rebuilt), it needs to be 'activated' or else the game will exhibit unwanted behavior (such as the "yellow exclamation points" often seen.)
To do this, simply add the file to the top of your
openmw.cfg, like so:
fallback-archive=Morrowind.bsa fallback-archive=Tribunal.bsa fallback-archive=Bloodmoon.bsa fallback-archive=Windows Glow TR.bsa fallback-archive=TR_Data.bsa fallback-archive=PT_Data.bsa
Above is what your "bsa section" would look like if you used every mod in the recommended list, and ordering matters. But that's all there is to it, "registering BSAs" just boils down to adding a line to your config file.
If you start OpenMW with a BSA registered that does not exist, there will be an error telling you about it and the game will not start.