But you can separate the file format of the executable from the loading process, i.e. implement "doing what the OS loader does" on your own. This way, you can d

But you can separate the file format of the executable from the loading process, i.e. implement "doing what the OS loader does" on your own. This way, you can define your completely own executable format instead of being forced to use the one that your OS wants you to use, or even decide that it doesn't have to be a file format (e.g. stream the data from a network stream).