The Microsoft C standard library implementation also takes this approach - C++ implementation with C exports, for the reasons called out by the sibling comments.
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zemoo
That does not always necessarily follow. The VC runtime, for the C portion of the library, is now written in C++ internally.
Windows has moved to an evergreen OS model: http://blogs.windows.com/bloggingwindows/2015/01/21/the-next...
Interestingly enough, it wasn't $future_version, but version 1.0, that didn't even support .NET and was scriptable only through JS. Silverlight is still scriptable through JS to this day. Given that Silverlight already supports a hybrid model I can image we could expect that to continue, with HTML as a possible alternative UI langauge to XAML.
That's probably the issue with the JS standard they discuss here: http://blogs.msdn.com/b/ie/archive/2010/07/16/how-ie9-platfo...
The Vatican started doing that millenia after there were no native populations of latin-speakers left.
why not R6RS?
FolderShare was acquired. I don't know if Microsoft has done a terrible lot with the program since the acquisition to be able to claim the success as its own.