Originally Posted by Gordon Scott
FWIW, "26 acoustic guitar (steel)" is the GM instrument definition for instrument patch #26, so that's where the definition comes from. PGM are just saying it's a steel-strung acoustic guitar, nothing more than that. They may/could/should put more detail in the notes.
From the old DOS midi days, now it's "Look Ma no Midi" real instruments need real names so when you search it will show all the same instrument that will match in tone.