This is an alternative way to save a bif using a tga, without relying on an lbm file saved through Grafx2. (I used the version of paint-shop-pro avaliable in the tools download area to do this.)

First, take a bmp extracted from the original bif and save it as both a tga and lbm in a program like paint-shop- pro. The tga file will need to be saved as “10001,” for simplicity sake I named the accompanying lbm 10001 also.
Second, open the program called Seqgrab, and set the information as follows:
– In “path to images” write the location of the 10001.lbm file, e.g., for mine it was “C:\Program Files\Total War\CA_BIF_BUF_Utils”
– In “filename stub” type “1”
– Type in the location of your new lbm file, the one saved as 10001.lbm, where it says "lbm to import from...", e.g., for mine it was “C:\Program Files\Total War\CA_BIF_BUF_Utils\10001.lbm”
– Check the square that says “whole frame grab”
– Check-off the square that says “purple as transparent”
Choose OK and a bif named "1" should appear.