mike@Home-PC:~/rockbox/winsim$ file /home/mike/rockbox/winsim/apps/bitmaps/mono/default_icons.o
/home/mike/rockbox/winsim/apps/bitmaps/mono/default_icons.o: ELF 32-bit LSB relocatable, ARM, EABI5 version 1 (SYSV), not stripped
So something is wrong there.