Can I use Archive::Zip to extract Unix gzip files?
No. There is a distinction between Unix gzip files, and Zip archives that also can use the gzip compression. Depending on the format of the gzip file, you can use Compress::Zlib, or Archive::Tar to decompress it (and de-archive it in the case of Tar files). You can unzip PKZIP/WinZip/etc/ archives using Archive::Zip (that’s what it’s for) as long as any compressed members are compressed using Deflate compression.