FS-UAE

kickstart_ext_file

The option documentation is properly formatted yet

Example: path/to/extended-kickstart.rom

The path to the extended kickstart ROM (for CD32 or AROS). If the ROM file is located in the standard kickstarts dir, it can be referenced by name only, no directory component is needed.

Code:

if c.kickstart_file.explicit:
    value = c.kickstart_file.explicit
else:
    value = ""

Source: https://github.com/FrodeSolheim/fs-uae/blob/master/docs/options/kickstart_ext_file