DotNetZip – Solving Mac Decompression Issues

This article addresses a common problem when using the DotNetZip library in an ASP.Net Web API service: zip files downloaded on a Mac fail to extract, often creating .cpgz files instead. The root cause is setting the response ContentType to 'application/zip', which causes Safari and Mac's Archive Utility to mishandle the file. The solution is to change the ContentType to 'application/octet-stream', which prevents automatic decompression and allows standard extraction. The article provides code examples and explains the underlying issue, making it useful for developers working with zip file downloads in cross-platform environments.