I wrote about the Cuban pesos thing several years ago.  I just edited the default dictionary with "cup" (no quotes) with "Cup" (also no quotes) and that fixes that.

I'd imagine substituting "mp3" with "M P 3" making sure the match is case insensitive would do the trick for that one.
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Brian - Windows 10 Pro, 64-Bit, Version 1909, Build 18363  

Science has become just another voice in the room; it has lost its platform.  Now, you simply declare your own truth.

      ~ Dr. Paul A. Offit, in New York Times article, How Anti-Vaccine Sentiment Took Hold in the United States, September 23, 2019