Since version 9.0 Winzip has had the option of creating 256-bit
password protected .zipfiles.

Does anyone know of a Linux tool to extract these zipfiles?

Version 5.5.2 of unzip doesn't;

# unzip aes-256zipfile.zip
Archive:  aes-256zipfile.zip
   skipping: aes-256zipfile.zip  unsupported compression method 99

GC

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