By Colum Murphy and Eva Dou 

Chinese antitrust regulators are intensifying pressure on foreign technology and auto companies in separate moves that experts say show Beijing's desire to give Chinese companies greater heft in their dealings with foreign firms.

Chinese antitrust regulators from the State Administration for Industry and Commerce said they conducted surprise inspections on Wednesday of Microsoft Corp.'s China offices for suspected monopolistic practices. They said they were seeking executives who weren't in their offices when they raided its offices last week over suspected monopolistic activities.

"We're serious about complying with China's laws and committed to addressing SAIC's questions and concerns," Microsoft said Wednesday.

SAIC officials also said they are investigating Accenture's offices in the northeastern Chinese city of Dalian because the consulting firm was doing outsourced financial-services work for the U.S. software giant.

"We can confirm that, as required by Chinese laws, we are cooperating with investigators of the State Administration for Industry and Commerce and help provide them with certain information related to one of our clients. We have no other information for public disclosure," said a written response from the marketing department of Accenture Greater China.

Separately, a second Chinese antitrust agency on Wednesday said it would punish Audi AG and Fiat Chrysler Automobiles' Chrysler arm after an investigation found the two luxury-car makers had pursued monopolistic practices. Under China's antimonopoly law, the companies could face fines of up to 10% of their sales from the preceding year.

The companies have said they are cooperating, though they declined to release further details.

Experts say the rush of antitrust probes stems from increasing aggressiveness by regulators and a greater focus on the prices Chinese consumers and companies pay.

In particular, they are increasingly focused on Chinese companies' dealings with foreign partners. In many of the recent antitrust cases, the focus has been on foreign companies with dominant market positions and few or no alternative providers in China.

In the car industry, Chinese auto dealers say foreign brands push them to take more cars into inventory than they want or can afford and stipulate that dealers must buy auto parts from the car maker. Audi, an arm of Volkswagen AG, said pricing officials in China's Hubei province are investigating the German car maker's network of dealers there.

"Currently car makers spare no efforts to manage everything, even if it could be something as trivial as a showroom desk," Chinese auto dealer Lentuo International Inc. Chief Executive Jing Yang said in a recent interview.

Speaking in terms of broad industry practice, he added, "they will tell you where you should buy and how much you should pay. Dealers have no options at all."

Lentuo dealerships sell brands including Audi, Volkswagen, Mazda, and Toyota.

An official at the China Automobile Dealers Association, an industry group, said the NDRC's investigation was a "good start" but that the impact on dealers will be limited until regulations governing how to sell cars in China are changed.

China's intent with Microsoft is less clear because SAIC officials haven't disclosed the focus of the probe, beyond citing compatibility and bundling issues with its Office and Windows software. But it comes as the Chinese government has reacted with increasing concern to Microsoft's efforts to switch users to its new Windows 8 operating system. China banned procurement of Windows 8 for government offices earlier this year.

In China, Microsoft's venerable Windows XP has a nearly 55% market share, according to analytics firm StatCounter.

"There's been some anger among consumers and companies over Microsoft dropping support for Windows XP," said Duncan Clark, chairman of Beijing-based consultancy BDA China.

Microsoft has also struggled to get customers to pay for its software in China, where piracy is rampant. In 2011, then-Chief Executive Steve Ballmer told employees that Microsoft's revenue from China that year would be only 5% of U.S. revenue due to piracy.

Confusing matters, China has three regulatory agencies that oversee antitrust issues. The auto probes are being conducted by China's National Development and Reform Commission, which is China's top economic policy body and its top authority on pricing. The Microsoft probe is being conducted by the SAIC, which oversees nonpricing antitrust issues. A third, China's Ministry of Commerce, oversees mergers.

"The SAIC, NDRC and even the Ministry of Commerce are jockeying for position, trying to be seen to be tough on foreign companies," Mr. Clark said. "There is the attempt to gain the upper hand among these bodies."

The potential impact on the auto companies isn't yet clear. Macquarie Securities analyst Zhixuan Lin said in a research note that fines on auto makers may be "insignificant" because they have been "very cooperative" and have cut prices "proactively."

Rose Yu in Shanghai and Yang Jie in Beijing contributed to this article.

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