Help me to open data set .img file in ImageJ

I have downloaded the data set with the .img format
but when opening it the format doesn’t support.
when I read a journal that uses this data set, he tells me that it uses imageJ and can save in the .bmp format
please help, I am a beginner in this mattera

What format is that? Surely not a “disk image file” as recognised by the OS.

The ISO format (maybe an ISO file) from the researcher’s journal contains the chest x-ray image, but I have difficulty opening the file.
maybe you can help me?