The trick is in the “multiple language” option
QuarkXPress Passport files can be saved so that the “normal” QuarkXPress can read it. When saving a file, QuarkXPress Passport offers you the option to save the file as either “multiple language” or “single language”. If you choose “multiple language” only QuarkXPress Passport will be able to read the file. If you choose “single language” also the “normal” version of QuarkXPress will be able to read it.
Make sure also that the QuarkXPress file is saved in a compatible version. For example, if you have Quark 5, the person using Passport has to save the Quark document as version 5 or earlier, or you won’t be able to open it.
QuarkXPress Passport allows you to use different languages in one document. This means that if you have Italian, German and Spanish in the same document, you will be able to apply the correct hyphenation as it applies to those languages. So you won’t wind up hyphenating German words following Italian grammatical rules or vice versa.

