I also tried to add more apps to kolibrios.img, but the format is quite small and I cannot add something new.
KolibriOS floppy image (kolibri.img) is limited to be 1.44M by design, there is no way to increase it. You have to use a CD
images if you need more storage.
I made a .img file using BOOTMOSF.BIN as boot program, and it didn't boot.
If you still want to create your brand new floppy image (instead of using the prebuilt one
), look here
. You'd better modify existing images, really.