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Microsoft is killing WordPad in Windows after 28 years
(www.bleepingcomputer.com)
This is a most excellent place for technology news and articles.
RTF is a rarity these days since basically every phone, tablet, and other handheld device can handle either PDFs or HTML (and ePub is basically just a ZIP file with HTML in a specific naming scheme and structure). Back in the day though you'd find RTFs more often for use in budget/jury-rigged eReader options. It's much easier to parse, if nothing else.