Indigo files as exported from Blender file via:

bpy.ops.export_scene.ailmr(
filepath = "/Users/jan/tmp/multi/simple_room.ailmr",
opt_lighting = 'global_illumination',
opt_aov_N = False, opt_aov_P = False, opt_aov_Z = False,
opt_aov_direct_diffuse = True,
opt_aov_direct_specular = True,
opt_aov_reflection = True,
opt_aov_refraction = True,
opt_aov_indirect_diffuse = True,
opt_aov_indirect_specular = True)