Hi spwolf,
The zip archive had been stored on a CDRW disc: most other zipped files on the disc extracted ok.
Regarding that first reported error message, I came across it when attempting to extract all files at once.
I have now encountered these two other pop-up error messages (applicable to several files) during my attempt to extract the files one at a time from the zip archive: “DynaZip Secure UnZip Error: Bad CRC” and “CRC Error. Continue?”
Laurence