Bookworm
Never had a problem with any I've filed that way, and still receive them in that format.
But then as the vast majority of people that this applies to will not be afected by the vagaries of IFPS it's not really a problem. In fact, having filed IFPS plans in that format they've still been accepted.
Pedantry taken too far perhaps
(And I thought the original question had been answered)
CM