They they would need to be able to download the public file if they are inclined to do so. Similar to coming into a branch and asking for a copy they have a right to receive a copy of it and you have the right to charge them a reasonable fee for providing it in a form they can take.
NOTICE: This email message, including any attachments, is intended only for the addressee, and may contain confidential and privileged information either as protected work product or confidential client information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, do not read, copy, retain, or disseminate this message or any attachment, and please contact the sender by reply e-mail or at 888.760.5646and destroy all copies of the original message and attachments. Neither the transmission of this message or any attachment, nor any error in transmission or misdelivery shall constitute waiver of any applicable legal privilege.
THIS EMAIL AND ITS ATTACHMENTS DO NOT CONSTITUTE LEGAL ADVICE