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The Windows UI is using the VCL (Delphi's visual component library); it's easy to see with spyxx.exe or similar from the Windows SDK and viewing the window class names: tSkMainForm, TChromeMenu, TSkypeSplitter, TScrollBar, TAccessibleTntEdit (TNT Unicode controls), etc.

As to why it was chosen, I can briefly list my (biased) opinion as to the benefits of Delphi: an easier to use language than C++, proven IDE and framework, a lot of third-party code and components available, but without sacrificing low-level control to a VM.

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