some files are composed of multiple brres files (like 80 or such).
after deleting the 1st part (above the first bres),
search again for the next bres.
cut everything above that and paste it in a blank file
(I like to create txt documents and rename them to brres)
now use fortwaffles mdl0 header fix on that and it should work perfectly

and just repeat the process on the original file until you finish it...