Normally, when I used Snaphu export with TOPO option, the created file is like above. Normally, it should be a wrap file to unwrap it but I didn’t have any file like that. (Before, in my old laptop, I used DEFO option, and it worked normally. So I am not sure that is the problem of my laptop or the problem of the option)
Try creating the interferogram again. Phase header (.hdr) and (.img) are missing. Have you back geocoded correctly containing both reference and secondary?
I did solve it, I have to choose phase and coherence options in multi-look.
But I don’t know why, as I understand, choosing non-option is the same as choosing all options.