I have no idea what to tell you. I downloaded, opened your file and extruded it, no issues. See screencast. I have attached my version of your model.
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John Hackney
Retired
Beyond the Drafting Board
It seems like the issue is that it isn't using the font I used. It wasn't a prebuilt windows font, so I guess it can't import it without it being present into windows (I expected at least a warning when a used font is missing, like adobe softwares do).
The font is this:
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