The preview functionality works nice for PDF files but I'm getting an error for a simple Excel file. Is this because there is still more to do on the previewer? 2017-07-13_13-36-16.jpg 
customized Desktop PC (Haswell i7 4770 3.4 gHz with 32 GB RAM), Windows 10 Pro 64-bit, 256 GB SSD,  and a Microsoft Surface Pro 2017, Windows 10, 512 GB SSD, 16 GB ram, i7
The preview functionality is part of Windows and whatever application is being previewed. Unfortunately Microsoft has not done a very good job of it and it sometimes does not work. This is beyond our control.

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