Part 1
A quick web search on "linux winmail.dat" pointed to a tool named tnef which is in the repos. Installed it and opened a terminal where I had downloaded the file from the email, and typed:
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tnef winmail.dat
Part 2
I could see the signature form, but could not print it with the default qpdfview. I was in a hurry, so took a screen capture, pasting that in a document, printing that doc, signing it, and scanning it to a PDF. Master PDF Editor, I subsequently ascertained, was able to print it correctly.