Hello to everyone!

Now this is a hard one, since I couldn't find the answer anywhere on this forum.
Old version of Word (2003), and there is a need for the macro which would do the following:

Print 10 pages of a document "A", but the 10th page would be printed duplex, so that the back side of that page would be a pre-written document saved in, for example c:\documents\document1.doc.

So that document1.doc should be a back side of a 10th page printed in duplex.

With the macro activated, 9 pages would print normally, but the 10th page would print a duplex side from the document1.doc file and then the front from the document "A".

Let's say that the duplex is being printed in Tray2.The rest is Tray1.

No idea how to do this and no references on the internet that could be of any help whatsoever.

Thanks for the help in advance!