BRUSSELS :Norwegian browser maker Opera filed a complaint about U.S. tech giant Microsoft to Brazilian antitrust authority CADE on Tuesday alleging its Edge browser has an unfair advantage, underscoring the long-running rivalry between the two companies. Opera complained to the European Commission in December 2007 about Microsoft tying its Internet Explorer browser to its Windows operating system. The case eventually ended with a 561 million-euro ($648 million) EU antitrust fine for the U.S.