[ms office - 2010] Publisher opening multiple documents

[TechSupp]

We had this problem with office 2003 and I hoped it would go away but a change to 2010 has made no difference. If a pupil opens up a publisher document in their own folder it opens up other publisher docments in other peoples folders (ones that other pupils have open to work on). If all the class are using publisher this causes some problems. Office is installed locally but they all log on under the same name. We have redirected desktop, start menu and documents so I presume its because it somehow knows which documents are already open. Its only Publisher that does this, Word, Powerpoint, excel all work correctly and only open the document requested.