[Cyberduck-trac] [Cyberduck] #11581: Downloads of 850MB or larger files fail on S3 with "access denied" error when "Segmented downloads with multiple connections per file" is checked

[Cyberduck]

#11581: Downloads of 850MB or larger files fail on S3 with "access denied" error
when "Segmented downloads with multiple connections per file" is checked
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 Reporter:  martin_w            |         Owner:
     Type:  defect              |        Status:  new
 Priority:  normal              |     Milestone:
Component:  core                |       Version:  7.8.2
 Severity:  normal              |    Resolution:
 Keywords:  segmented download  |  Architecture:  Intel
 Platform:  Windows 10          |
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Comment (by martin_w):

 Interesting! The total length of the full path and filename is 129
 characters. The filename itself is long: 103 characters. Still, it's hard
 to understand why this would exceed NTFS limits, which are 255 characters
 for an individual file or folder name, and 260 characters by default for
 the total path length. (But per [https://docs.microsoft.com/en-
 us/windows/win32/fileio/maximum-file-path-limitation|this article], the
 limitation can be removed to support up to 32,767 characters).

 Is CyberDuck doing something like maybe converting to a double-byte
 character set that would cause the 260 character limit to be exceeded
 (when combined with the `.cyberducksegment` extension)?

 To test your idea, I tried `"Download as..."` and gave the downloaded file
 a very short name. Indeed, with a short name, the file download continued
 without error even when `"Segmented downloads with multiple connections
 per file"` is '''checked'''.  So it '''is''' related to Windows long path
 limitations.

 I've configured my Windows registry
 (`Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FileSystem\LongPathsEnabled`
 set to '''1''') to allow along paths. Does CyberDuck support long Windows
 paths (via the `longPathAware` element in its application manifest, per
 [https://docs.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-
 limitation#enable-long-paths-in-windows-10-version-1607-and-later|this
 article]?

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Ticket URL: <https://trac.cyberduck.io/ticket/11581#comment:2>
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