Opening downloaded zip file creates cpgz file?

Question

If I make the url for a zip file the href of a link and click the link, my zip file gets downloaded and opening it gets the contents as I expect.

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Answer 1

Another possible answer, I found After much searching, I found that the two possible reasons for a *.zip "unzipping" to a *.zip.cpgz are:

1. the *.zip file is corrupted
2. the "unzip" tool being used can't handle >2GB files

Being a Mac user, the second reason was the cause for my problem unzipping the file: the standard Mac OS tool is Archive Utility, and it apparently can't handle >2GB files. (The file in question for me was a zipped 4GB raspbian disk image.)

What I ended up doing was to use a Debian virtual machine, already existing in Virtual Box on my Mac. unzip 6.0 on Debian 8.2 had no problem unzipping the archive.