Even if Mi[¢]ro$oft is telling someone how to tweak settings through Visual Studio, that is not any kind of open-source.
Open-source products are ones which the publisher provides to the user, free of charge, the entire source-code of the product. The user, depending on the license, may or may not have rights to modify or redistribute the code, but publication of source-code is a necessary part of being open-source. Despite their having provided parts of the source code of some products, Mi[¢]ro$oft's publishing methodologies are not open-source at all.
Open-specification products are ones which the entire product, all of its API calls, are documented and that documentation made available to the user. Mi[¢]ro$oft's publication methodologies fail this, too, as the company is notorious for having hooks into the Win32 API that only they know about. While Mi[¢]ro$oft is getting better on the open-spec front, it is not there yet.
So Mi[¢]ro$oft publishes closed-source, mostly-closed-spec software.
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