Moderator: Phil Barton
IAttachmentFile -- does exposes a method called GetStream, however it doesn't bring any data for archived contents.
Currently the Archive feature is available on SPAdmin->Configuration->General Settings->Archive
Alternatively, (if APIs are not available), is there a database route to retrieve the archived Order attachments?
Can you provide more background about your setup? I suspect that is where your issue lies and not with Select itself.
Sr. Software Architect