I fully agree with LxLasso here. The specs really must permit files to be compressed with deflate. In fact, it's usually faster if they are compressed - the CPU usage cost is almost always much smaller than the extra data transfer time, even on SSDs! "Uncompressed ZIP" is also something that is not well tested in ZIP libraries. We've already noted that Vectorworks 2019 thru 2021 SP2.1 are creating invalid files with an incorrect ZIP size attribute. Some extractors don't notice (eg Windows and macOS built-in), while others like 7-Zip do and report that the file is corrupt. This is almost certainly because the ZIP library VWX is using wasn't properly tested in this mode.