WAB translates through CSV like its era mates, with the translator choice depending on which Windows you have available:

On an older machine, XP through 7, the address book application itself still opens the file: double click the wab or run wab.exe, then File, Export, Other Address Book, Text File (Comma Separated Values), ticking the fields worth keeping. This native export is the cleanest read of the format and worth doing on the old family PC itself if it still boots, before it goes wherever old PCs go.

On Windows 10 or 11 where wab.exe is long gone, the Contacts folder inherits the job: press Win+R, run shell:contacts, and use the folder toolbar's Import choosing Windows Address Book (Outlook Express contacts), pointing at the wab. The entries become individual contacts in the folder, exportable from the same toolbar as CSV in a second step. Two hops on modern Windows against one on old, both arriving at the same CSV.

The CSV then imports at contacts.google.com through Import, landing under a dated label for review. Field mapping from WAB's era usually needs one glance, the name and email columns mapping cleanly while home phone versus other phone occasionally lands sideways, editable per contact afterward for the handful of relatives affected. Names with accents deserve one spot check too, era CSVs sometimes carrying encoding scars that a quick edit heals.