By Eva Dou 

China is investigating Microsoft Corp., the company said on Monday, in the latest challenge in what has proved to be a difficult market for the software giant.

In a statement on Monday, the Redmond, Wash., company said it was working with officials. "We aim to build products that deliver the features, security and reliability customers expect," Microsoft said in a statement. "We will actively cooperate with the government department's investigation and answer related questions."

The statement didn't disclose additional information.

Two people familiar with the inquiry said Chinese corporate regulatory officials made surprise visits to Microsoft's offices in four Chinese cities.

It wasn't clear what the probe was focused on. The company hasn't been accused of wrongdoing.

China's AIC acts as the nation's corporate registry and has some marketing and antitrust responsibilities. It couldn't be reached for comment late Monday.

AIC officials sometimes pay visits to industries under official scrutiny that don't result in formal probes. Last year, when Chinese government officials were probing the pharmaceutical industry in the wake of bribery allegations against GlaxoSmithKline PLC, AIC officials visited the offices of Roche Holding AG, AstraZeneca PLC, Bayer AG and Sanofi SA. The companies haven't been accused of wrongdoing.

State media named Microsoft among the companies that have faced scrutiny from Beijing following allegations of cyberspying between the U.S. and China. U.S. technology firms have suffered a chill in China since former U.S. contractor Edward Snowden alleged last year that the National Security Agency was spying on Chinese leaders and that U.S. tech firms were providing data to the government.

Microsoft also faces longtime challenges. It has historically struggled with rampant piracy of its software in China, resulting in disappointing revenue. Although Microsoft has tried a range of tactics to reduce piracy, it has met with limited success.

Microsoft doesn't disclose financial details of its business in China, but the company's chief financial officer last week said the company continues to "see challenging conditions in China" because of a "weak business environment" experienced by other multinational firms. Microsoft said it doesn't expect business conditions to improve soon.

Microsoft had been in the Chinese government's cross hairs before this week. China's powerful state-run television broadcaster ran a report in June that questioned the security of its new Windows 8 computer operating system. The broadcast quoted Chinese experts who argued that Microsoft cooperated with the U.S. government to carry out cyberspying.

A Microsoft spokesman had declined to comment on the broadcast, but the company's general counsel, Brad Smith, had previously described the steps Microsoft had taken to prevent government snooping and protect customer data.

China's Central Government Procurement Center said in May that the government couldn't purchase computers loaded with Windows 8. Microsoft decided this year to pull the plug on support for its aging but widely installed Windows XP software.

The government ban came shortly after the U.S. charged five Chinese military officers with spying by hacking into U.S. computer systems.

Other U.S. companies have also been under scrutiny in the country. China's state broadcaster also raised questions about the security of the iPhone in July, allegations that Apple Inc. has denied.

Microsoft and other U.S. tech firms have worked to tamp down public mistrust following the Snowden revelations. In June, Microsoft publicly opposed a U.S. government search warrant for a user's emails stored on company computers outside the country.

The software maker has also striven to build bridges with local companies in China amid the security concerns. In June, Microsoft struck a deal with Chinese security vendor Qihoo 360 Technology Co. to cooperate on developing some technologies.

Microsoft will offer early advance sales of its Xbox One consoles in China through Internet conglomerate Tencent Holdings Ltd.'s chat services, Tencent's online retailing partner JD.com Inc. said on Monday.

Yang Jie and Shira Ovide contributed to this article.

Write to Eva Dou at eva.dou@wsj.com

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