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Yes, that is why I said that I have asked Sonos and had no reply. I therefore asked the question as a more generic one - what places might they have saved this detail.
You are going to have to wait until they do reply - there are loads of places you could store that: the registry, the Appdata folders, the app folder, hardcoded into the app, a config file, an ini file, a csv file, a binary file, ... there are just too many possibilities, and file or folder names don't have to be anything obviously related to a specific app. For example, if you visit my appdata/local folder, you will find 53 folder names with the format "{GUID value}" before you get to any with readable text. Open one at random, and all it contains is a folder called "Favourites" which holds "0.txt" to "7.txt" inclusive. What app is that related to? I dunno ...
Simply put: the only people who can help you are Sonos, you need to talk to them.