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No, don't forget that x64 will redirect calls so that needs to be accounted for. Also I'm mentioning the path where to look for the EXE not just if the path exists as it will exist with a few files in it on x64 even if you have the 32-bit Office installed. But if you have the 64-bit version of Office installed then the EXE files will be in the C:\Program Files\Microsoft Office\Office15 folder. IF you find Excel, Word etc in the C:\Program Files\Microsoft Office\Office15 folder then you have to be running the 64-bit version of Office.
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