Beat cream cheese until smooth. Fold in crab, scallions, garlic, Worcestershire, soy, sugar, salt, and pepper.
Set up wrappers, a small bowl of water, and a tray. Keep wrappers covered with a towel.
Spoon about 1 heaping teaspoon filling onto a wrapper. Brush edges with water.
Fold into a triangle and press to seal, pushing out air. Pinch two corners together for the classic shape.
Heat oil in a deep pot to about 350°F, at least 2 inches deep.
Fry 6–8 wontons at a time until golden, 2–3 minutes, turning once.
Drain on a rack or paper towels. Rest 2 minutes and serve with sweet chili sauce.