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The OpenDoc Society, which had argued Microsoft's Office Open XML (OOXML) format was unripe for ratification by the International Organization for Standardization (ISO), published the results showing Microsoft's win on its Web site.

Microsoft welcomed the decision, which was leaked on Tuesday ahead of an official ISO statement expected on Wednesday, saying it created a "level playing field" for OOXML to compete with other standards.

Supporters of rival Open Document Format (ODF), which is already an ISO standard and widely used, said multiple formats defeated the purpose of having standards and that the result would help Microsoft tighten its grip on computer users.

Tom Robertson, Microsoft's head of interoperability and standards, said: "Open XML joins the ranks of PDF, HTML and ODF among the ranks of document formats. I think it makes it easier for governments to offer users choice."

"The control over the specification now moves into the hands of the global community. This is going to be one of the most, if not the most important document format around the world for years to come," he added in a phone interview.

James Love, director of Knowledge Economy International, which campaigns for fairer access to knowledge, told Reuters: "We are disappointed."

"Microsoft's control over document formats has destroyed competition on the desktop, and the fight over OOXML is really a fight over the future of competition and innovation."

Microsoft, shepherded through a fast-track ISO approval process by European standards organization Ecma, lost a first ISO vote in September. Under the process, a second vote was allowed after a so-called ballot resolution meeting last month.

In the second voting period that closed on March 29, Microsoft won the approval of 86 percent of voting national bodies and 75 percent of those known as P-members. A two-thirds majority of the P-members was required.

Among those voting in favor of OOXML were the United States, Britain, Germany and Japan, according to the OpenDoc Society list. Opponents included China, India and Russia.