On 3.10.2019 13:07, Costello, Roger L. wrote:
> It seems like that would have the advantage of showing with great clarity of type of file it is. Yes?
May be, but it's legacy. Many older operating systems supported only 3
characters as a filename extension. Although this limitation is no
longer true I personally don't see any advantage in using 3 extensions
at the same time. I know that .xsl is a text file in XML format
containing XSLT transformation. There are not that many file types in use.
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