[Geoff]

Richard Crowley wrote:
4. When zipping and unzipping mp3 files in Winzip and WinRar, is
there any quality loss?

Probably not.

In cases 1-3, you are "reconstructing" the audio from a LOSSY
compression (MP3) Repeated trips through this compression-to-
decompression-to-compression path produce additional LOSS
every time you make the trip.

ZIP in general is a NON-LOSSY compression scheme.

ZIP is not "in general" non-lossy - it's outright non-lossy.

In which case it's not "probably not", but "No".

geoff