OS Coding help

[MidnightX]

I'm Developing an OS.
I know it very hard to write a OS and takes a lot of work but I would like to develop my very own OS.
How do I write a code that can run a app\game file? from scratch?

[heepoo]

you need to implement a way to parse executable files like elf or coff
visit
http://osdev.org/
there you can find anything about that and every aspect of OS development