There are two different kinds of txt file.
One is for the ???.lbm
ex: XBow.txt -> for XBow.lbm
(maybe for software simulation)

The Second is for ???.bif
ex: XBowPage.txt -> for XBow.bif

If you want to use XBow_H.bif, you need to enlarge the rectanges.
Because Xbow.bif -> 256x256, XBow_H.bif -> 512x512.