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So, was excessive path length the actual reason? The info that Windows uses to throw up those security warnings is carried in an "alternate data stream" in the file. That ADS can be lost by copying to a non-NTFS filesystem, or by using benighted software to copy, and so on.
– kreemoweet
Commented Oct 28, 2017 at 4:07
@kreemoweet correct, excessive path length was the reason. I could check it by trying to rename the file: Windows explorer wouldn't let me as the filepath was too long. I instead unzipped using "unzip here", resulting in shorter filepath, and it worked. Hard to believe I know
– Franck Dernoncourt
Commented Oct 28, 2017 at 5:00

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