[Plugin: WP Publication Archive] Not picking up Excel Icon

This could have something to do with the MIME type of the file. It’s worked fine with XLS spreadsheets in the past, but I’ll mark this as a bug for now and see what I can do to diagnose and fix in the next release: https://github.com/ericmann/WP-Publication-Archive/issues/18

I’m not sure what you mean by “in the order I like” … can you clarify?