Initial changes required for ZIP64 support #2
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This is probably not complete and it's not well tested, but it allowed me to open a zip file with version 45 that was using the ZIP64 extension.
Most importantly, it does not allow reading ZIP files that would actually need this extension. It only makes things work for ZIP files that are using the extension fields for storing the file sizes, but it can't actually handle the higher size limits that are possible this way.
GitHub-issue: #1