Halve squash lengthwise; remove and discard seeds. Place squash, cut side down, in a 2-quart rectangular microwave-safe baking dish. Microcook, uncovered, on 100 percent power (high) for 12 to 16 minutes or till just tender, giving dish a half-turn once.
Meanwhile, in a small bowl combine apple and apricot slices, nectar, honey, and nutmeg. Turn squash over, cut side up. Spoon fruit mixture into squash cavities. Dot with margarine or butter. Micro-cook, covered with waxed paper, for 4 to 7 minutes or till fruit is hot. Sprinkle with additional nutmeg, if desired.