hubieran adjuntado
-they/you had attached
Past perfect subjunctive ellos/ellas/ustedes conjugation of adjuntar.

adjuntar

Lo segundo que desearía decir es que nosotros -tal y como habíamos propuesto la Sra. McCarthy y yo mismo, como ponentes del reglamento general- preferiríamos que las directrices se hubieran adjuntado como apéndice al reglamento.
The second point I would like to make is that we would have preferred it if the guidelines had been added to the regulation in the form of an annex, as we and Mrs McCarthy, as rapporteurs for the general regulation, had asked.
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