A Chinese regulator said on Tuesday it is conducting an anti-monopoly investigation into Microsoft Corp (MSFT.O) over its Windows operating system, in the latest in a growing number of competition probes that have unnerved Western firms in China.
China's State Administration for Industry & Commerce (SAIC) was also investigating a Microsoft vice president and senior managers, and had made copies of the firm's financial statements and contracts, the agency said on its website.
It said Microsoft, which has struggled to make inroads in China due to rampant piracy, had not fully disclosed information about Windows and its Office software suite.
Microsoft is one of the biggest U.S. companies to fall under the eye of Chinese regulators as they ramp up their oversight in an apparent attempt to protect local companies and customers.
The investigation comes as U.S.-China business relations have been severely strained by wrangles over data privacy.