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Re:Ask HN: What is something you do for clients that consist... by JosephHatfield on Monday December 12, 2016 @08:56AM (#13158018)
Newer versions of Excel will warn the user of possible file corruption if they try to open an .html file that has been renamed to .xls. The file can still be opened but the warning is bothersome.
Re:Ask HN: What is something you do for clients that consist... by jules on Thursday December 15, 2016 @08:06AM (#13184294)
An alternative is to make a .xlsx file with Excel, then unzip it. You'll get a folder with text files and then you'll see how to generate your own.