“As of March 1st, 2017, Neverwinter will no longer be supporting Windows XP and Direct3D 9, or Video Cards with a Direct3D Hardware Feature Level less than 10.0,” the studio wrote. “This decision was made in order to improve game performance and to optimize the player experience.”
The same is true for Star Trek Online, which dropped support for XP earlier this week as planned.
Source: Patch notes, FAQ
