And yes, you can save a file that a non-Passport user can open - you just have to make sure you save it as a single-language file.
Which is true for QuarkXPress 3, 4, 5 and 6.
From version 7 onwards the file format is the same, so the US and IE version of QuarkXPress can open files saved in QuarkXPress Passport.
Get Creative Pro Tools worth $1000 when you buy or upgrade QuarkXPress 10
Go Pro (while supply lasts):
Want to create stunning HTML5-based animations for apps? Simply use InDesign or QuarkXPress
with App Studio, no other tool needed: http://AppStudio.net
Need immediate help?
Please contact Quark's support: http://support.quark.com/contact_us.html
Follow App Studio here: https://twitter.com/publishhtml5
Follow QuarkXPress here: https://twitter.com/QuarkXPress
Follow me here: https://twitter.com/HamburQ