I just downloaded your example, then converted it to .bmp with IrfanView, then created a new bif with readbif and imported the one frame from the bmp.
Please try to reproduce this, using irfanview.
How many images do you have to convert?
If it's just the one or a few I'd offer to do it for you but it's so easy that I want you to be able to do it yourself.
Come on, you can do it.

R'as