[tw5] How does this macro work to download a binary file?

[leeand00]

\define download-xlsx-tiddler(title,caption)
<a href={{{ [[data:application/vnd.openxmlformats-officedocument.
spreadsheetml.sheet;base64,]addsuffix{$title$}] }}} download="$title$">
$caption$</a>
\end




It's called like this:

<<download-xlsx-tiddler "Presidents and Justices.xlsx" "Presidents and 
Justices.xlsx">>




I see that it mentions the MIME type of the and the base64 format is also 
mentioned, but I don't think I really understand it.  It looks like it's 
using transclusion and a filter, but I don't really understand the "data:" 
portion and where the documentation for that is...but it's really neat as 
it means you can store any sort of file in a Tiddlywiki 5 and download it 
with a link.

Thanks!

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