This file is indexed.

/usr/share/mime-info/treeline.keys is in treeline 1.4.1-1.1.

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-treeline
        description: TreeLine Data
        [es]description: Datos de TreeLine
        icon_filename: treeline
        default_action_type=application
        short_list_application_ids_for_novice_user_level=treeline
        short_list_application_ids_for_intermediate_user_level=treeline
        short_list_application_ids_for_advanced_user_level=treeline