Programming via rbf file stopped working

I wrote a small C program that takes a snippet from the bootloader-application.pof (Note the strange thing: it is the pof file) that was genereated via the GUI application selecting the sof files of both bootloader and application. The snippet is from the application start address + 152 bytes to the end of the file. I then saved this snippet as an rbf file and programmed it through the bootloader application. This actually boots the application and everything works.

Why does the original application.rbf not work, while the above does the trick?