Heat oven to 400 degrees F. Coat a 13 x 9 x 2-inch baking dish with nonstick cooking spray. Place one of the flounder fillets skinned-side up on work surface, then spoon 12 cup crab mixture onto end of fillet; roll up, creating a small bundle. Repeat using remaining fillets and crab. Transfer bundles to prepared baking dish, seam-side down, and sprinkle with remaining 1/4 teaspoon Old Bay, 1/8 teaspoon salt and 1 teaspoon parsley. Add wine or water to pan; transfer to oven.