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Office file compatibility
Although applications originally written for x86/x64 versions of Windows won’t run on Windows RT, Office 2013 RT itself is compatible with Microsoft Office file formats. That means you can load and edit documents into Office 2013 RT that were created on the x86/x64 version of Office 2013, as well as save them in file formats that can be loaded into the latter. This compatibility works across all of the Office 2013 applications with their respective file formats (that include xls, xlsx, ppt, pptx, doc, docx).
In Pictures: 7 things we love/hate about Microsoft Office 2013 for Windows RT