First, there is a later update to 4.50 on this website, the 050407. This will be better for you.
The whole purpose of the mapping file is to allow you to add PDS materials to the file, and assiciate them with CAESAR II material numbers. If a material is found in the PDS neutral file, that isn't in the mapping file, it warns you, and assumes the properties of low carbon steel. It should still convert the file though.
(As far as your Version 5.00 goes, send an e-mail to "sales@coade.com" and ask where it is.)
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Regards,
Richard Ay - Consultant