Solution is to change the extension from ".txt" to ".pdf" after it has been downloaded.
OR switch to a different browser to download it.
So far, I've only seen this happen when downloading a PDF using the Edged browser...hasn't been a problem on IE11 or Chrome or FireFox (well, haven't heard that it occurs on those other browsers yet)
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
