[PC] Amazon Music app downloading music as .Low files?

I'm helping a loved one download music to their PC from the Amazon Music application.

When the download was finished, the files in the Amazon music folder are folders titled with two (seemingly random) letters or numbers, plain text files titled CURRENT, IDENTITY, LOCK, etc., and various other files.

The folders contain files such as "B000SX85CE.Low.16" All files in these folders have this same naming convention.