WORD file won't open from resources

I want learners to be able to open a Word file and copy text from that file to another app . When the Word file is chosen, rather than opening, I see the attached.

The PDF file opens, but the formatting is lost when text is copied, so that won't work. 

And, yes, both files are in the story_content / external_files folder in the published output. What am I missing?? 

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