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Just out of curiosity I want to know what language was used to write Windows itself.

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We use almost entirely C, C++, and C# for Windows. Some areas of code are hand tuned/hand written assembly.

http://social.microsoft.com/Forums/en-US/windowshpcacademic/thread/65a1fe05-9c1d-48bf-bd40-148e6b3da9f1

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Well, the Windows kernel is still almost entirely C. However, there are different aspects that use C++, say some parts of the shell and so forth. The core is C. Other languages, perhaps even .NET might be used in some corners for certain applications but C is the OS language of choice in Windows.

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