Is TDF with .html extension still supported?

[arkavo-com]

See

spec/README.md

Line 45 in 88b414f

* As a HTML file with extension of `.html`. For example, if you are trying to protect a file named `demo.jpeg`, the file will be stored as `demo.jpeg.html` after encryption. An example HTML file is (here)[https://github.com/opentdf/spec/blob/master/schema/HtmlProtocolExample.html].