Microsoft may have won a year-long quest to make its OOXML (Office Open XML) document format an ISO-recognized international standard, but claims of foul play in the voting process may come back to haunt the software giant when the European Commission concludes its latest antitrust investigation of Microsoft's business practices.

When the Commission, Europe's top antitrust authority, opened a probe into Microsoft's business practices in January, it said part of the investigation would examine whether OOXML, as the format is known, is "sufficiently interoperable with competitors' products."

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Microsoft, OOXML, Office Open XML, ODF, ISO, File Format, Document Format