I am not sure if I ask the right question, but this is the scenario I am trying to run:

Multiple files (XML and a few related files, "attachments") have to get into BizTalk as a single message. I have looked into existing adapters, and don't see that done with existing once. To be more accurate, files are taken from file system. Files are not found at the same time, but arrive one at a time, when order is not ensured. XML (content) file is the one that knows what attachments it has to have (what other files).

We are looking into BizTalk 2009 and I was wondering would be that responsibility of a custom Adaptor, or something else. And were I could look for samples.

Thanks.