So I'm hoping you can give me some pointers on what to look for and what to check, so that we can work this out together, perhaps? Why is 7-Zip failing to extract this Zip file? More broadly, what would cause 7-Zip to fail to extract a Zip file? Maybe you have some experience of your own that you can share with me? Do you use both Mac and Windows? Have you ever come across this type of problem? A Zip file created on a Mac not being compatible with a Windows PC? Let me know in the comments.