1. Cook rice according to package directions, omitting salt and fat. Place rice in a medium bowl; stir in 1/4 teaspoon salt and 1/8 teaspoon pepper.
2. Sprinkle fish with remaining 1/4 teaspoon salt and remaining 1/8 teaspoon pepper. Dredge fish in flour.
3. Heat oil in a large nonstick skillet over medium-high heat. Add fish to pan; cook 1 1/2 minutes on each side or until fish flakes easily when tested with a fork or until desired degree of doneness.
4. Add wine, juice, and capers to pan; cook 1 minute. Add butter to pan, stirring until butter melts. Remove fish and sauce from pan; keep warm. Wipe pan clean with a paper towel. Add spinach to pan; sauté 1 minute or until wilted. Place 1/2 cup rice onto each of 4 plates. Top each serving with about 1/3 cup spinach, 1 fillet, and 1 tablespoon sauce.