Hold that tought. I read wrong, but, I have distributed 2000 MDE files to users who only have XP and the files run properly. As far as ADP files, I have not had to re-distribute 2000 files to xp users. I do remember that Access 2000 ADP files have more functionalyty as far as the canned ability to manage SQL Server permissions, so it will leave room for trouble, also the views and stored procedures are shown differently. XP does have more capability for stored procedures.
I am not sure if the file would crash for sure. Try this site and you may find out more.
They have a section for client server apps (adp). Since your users will not be changing design items, they may be ok, but that is only a guess.