This file is indexed.

/usr/share/mime-info/ngraph.keys is in ngraph-gtk 6.07.02-2build3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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application/x-ngraph
        open=ngraph %f
 	icon_filename=application-x-ngraph.png
	description=Ngraph
	default_action_type=application
	short_list_application_ids_for_novice_user_level=ngraph
	short_list_application_ids_for_intermediate_user_level=ngraph
	short_list_application_ids_for_advanced_user_level=ngraph
	category=Documents/Graphics

application/x-ngraph-script
        open=gedit %f
 	icon_filename=application-x-ngraph-script.png
	description=Ngraph script
	default_action_type=application
	short_list_application_ids_for_novice_user_level=ngraph
	short_list_application_ids_for_intermediate_user_level=ngraph
	short_list_application_ids_for_advanced_user_level=ngraph
	category=Documents

application/x-ngraph-graphic
        open=ngraph %f
 	icon_filename=application-x-ngraph-graphic.png
	description=Ngraph graphic file
	default_action_type=application
	short_list_application_ids_for_novice_user_level=ngraph
	short_list_application_ids_for_intermediate_user_level=ngraph
	short_list_application_ids_for_advanced_user_level=ngraph
	category=Documents/Graphics