Opera has filed a complaint with Brazil's Administrative Council for Economic Defense (CADE) against Microsoft, alleging anti-competitive practices that favor the Edge browser. The complaint claims that Microsoft uses "all-or-nothing" bundled rebates to ensure PC manufacturers pre-install Edge as the default browser and employs "dark pattern tactics" that disregard users' browser choices and restrict switching from Edge in Windows "S mode." In Brazil, Opera's market share is 6.78%, compared to Edge's 11.52% and Chrome's 74.95%. Opera's General Counsel, Aaron McParlan, advocates for a browser choice screen similar to one previously mandated by the EU. Additionally, Opera has filed an appeal with the EU General Court regarding the European Commission's decision not to classify Edge as a gatekeeper under the Digital Markets Act. Microsoft has not yet commented on the complaint.