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I'm pretty sure that it is Heart of Winter that replaces the sprites. I remember when I first bought it I thought something had gone wrong with my computer because my beautiful game of IWD suddenly looked horrible. Eventually, I worked out what had happened and uninstalled it without ever playing it. I was such a relief to get the game back looking like it should.I'll likely play original IWD next so I can enjoy those sprites some more.You may actually need a mod for that. IIRC, either Heart of Winter or Trials of the Luremaster replaces the glorious BG1-style animations with those hideous BG2 ones. Unless, of course, you don't intend to install those expansions.