Remember, this action is about what the state was in the 90s. They've done a lot of reverse-engineering since then, and Microsoft has actually become cooperative.
They've asked for code now. Apparently they didn't like the documentation they received back in March.
They didn't think what Microsoft sent was good enough, and requested more complete documentation. Microsoft basically said "You want better documentation? We'll do you one better and give you the code." The EU didn't request code.
And it's still not enough:
http://news.bbc.co.uk/1/hi/business/4652730.stm
So, do you really dislike Microsoft this much that the Eurosocialists are now the good guys - one of those ends-justify-the-means kind of things?