问题
Currently, the .NET Framework 4.5 runs only on Windows 7 and above:
Operating system Version 4.5 Beta
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Windows 8 Consumer Preview √ (see notes)
Windows 7, all editions √
Windows Vista, all editions —
Windows XP Professional, all editions —
While I understand that XP support is being dropped, I'm a bit surprised by the decision not to support Vista. (After all, .NET 4 supported XP and above.)
Is there any indication (press announcements, MSDN blog entries, ...) that more operating systems will be supported when .NET 4.5 is released?
回答1:
Microsoft updated the their .NET Framework System Requirements page to reflect that .NET 4.5 now officially supports Windows Vista SP2, Windows 7, and Windows 8.
回答2:
Anyone can vote for making Windows XP supported on .net framework 4.5 here http://visualstudio.uservoice.com/forums/121579-visual-studio/suggestions/2723735-make-net-4-5-work-on-any-os-that-supports-4-0
来源：https://stackoverflow.com/questions/9989893/net-framework-4-5-operating-system-requirements-no-vista-and-xp