Apple has put the Mac versions of Pages, Numbers, and Keynote through some major revisions over the years. Early versions gave way to the “iWork ’09” suite in 2009, a major update and technically numbered version 4.
Then in 2013, Apple revamped them all again. While versions of the apps starting in 2013 (version 5) through the present (version 10) can open files created in the ’09 suite, version 5 and later can’t open pre-’09 releases, or versions 1 to 3.
Readers sometimes write in wondering how to extract documents they haven’t opened in years but never went through the ’09 update. Unfortunately, earlier versions of Pages are just obscure enough that they aren’t found in any of the major open-source and other software apps that can pick the lock on nearly every outdated format and all modern ones.
