Bentonville-based Wal-Mart Stores Incorporated is asking a federal appeals court to review a judge`s order on a massive discrimination lawsuit. Wal-Mart wants a review of a decision that granted class-action status for a sex-discrimination lawsuit, giving representation to as many as $1.6 million current and former women Wal-Mart workers. The suit alleges that the retail giant set up a system that frequently pays its female workers less than their male counterparts for comparable jobs and bypasses them for promotions. If the appeals court does not overturn the ruling, the case will become the largest private civil rights lawsuit in U-S history. The San Francisco-based appeals court did not indicate if it would consider Wal-Mart`s petition.