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public static bool is_file_supported(File file) {
    return is_basename_supported(file.get_basename());
}

public static bool is_basename_supported(string basename) {
    string name, ext;
    disassemble_filename(basename, out name, out ext);

    if (is_string_empty(ext))
        return false;

    foreach (PhotoFileFormat format in get_supported()) {
        if (format.get_driver().get_properties().is_recognized_extension(ext))
            return true;
    }

    return false;
}