Any claim otherwise is either outdated (pre-2016) or malicious. The correct technical answer:
When released its desktop version, it was a game-changer for XP users. Unlike other heavy software of the time, Viber offered a "top-tier" experience that actually worked on older hardware. viber pour pc windows xp top
A more stable method is installing an Android emulator that still supports Windows XP, such as Nox Player. Any claim otherwise is either outdated (pre-2016) or