On the latest #ATPpodcast I heard @siracusa pronounce the HEIC image format as a word - "heek" [hiːk]. He is the first human I have heard pronounce it as a word. I feel like, for me, it will always be "H E I C".
There are several acronyms I treat this way, that I've heard others say as words, thinking about it.
PNG, SVG, BMP, IFF, SQL, URL, LED, GUI, PDF, PCMCIA (well...), etc.
I am old and set in my ways.
By the way, GIF is not on that list because I pronounce it as a word starting with a soft G, because that is how that is pronounced.