Hi Altair,
I'm sorry MS Project 2003 no longer supports saving files as an MPX
format. The last version to support *.mpx format was Project 98.
It may be possible to find someone who can translate from MS Project
2003 to MS Project 98 and then from 98 save as mpx.
I assume you are trying to export information from Project into another
program? Project does allow exporting in other formats (Excel, Project
database, text, etc) through a File > Save As command.
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I hope this helps. Let us know how you get along.
Julie
Visit
http://project.mvps.org/ for FAQs and more information about
Microsoft Project.