While there isn't a single official "feature" by that name, the phrase "happy_new_year.zip" typically refers to several different things depending on your context:
If you found a file named happy_new_year.zip on a random site or in an unsolicited email, do not open it . It is a common format for distributing malware or "zip bombs" during the holiday season. HappyNewYear generates 'happy new year html ... - GitHub
Many apps, like the Happy Easter 2026 app or WhatsApp-specific packs, bundle "New Year" features as ZIP-like packages of stickers, GIFs, and themed frames.