Keynote files are application extensions for Apple iWorks Office Suite. You would need to export the file before converting it to another format.
And, even in doing so, there is no guarantee that the file's contents (fonts, layout, etc.) will be displayed as originally designed. In any case, export the file, then try converting it to a Windows format.
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No. There is no version of Keynote developed for Windows, and there is no way of running the Mac version directly.