[delphizip] Re: Windows 64 bit, file names > 256 characters.

  • From: James Turner <james.d.h.turner@xxxxxxxxxxxx>
  • To: delphizip@xxxxxxxxxxxxx
  • Date: Wed, 31 Aug 2011 17:53:31 +0100

Under Windows, MAX_PATH = 260 : that's the maximum length of an absolute 
file name (excluding UNC file names).

The limit of 256 characters is set by the Zip format since the length of 
the file name is stored in the header as a single byte.

As previously noted, NTFS permits longer file names and, for reasons 
known only to Microsoft, a silly prefix is required.

Getting around the 256 character limit of the zip format is tricky (and 
should not be expected) however, it should be possible to deal with 
longer filenames if they are relative to a specified directory.

I hope this clears up what is and isn't possible.

-- James Turner


On 31/08/2011 17:00, Patrick Kolla-ten Venne wrote:
> Actually, I think the feature you are referring to, is actually much
> older than 64 bit.
> Are you referring to the \\?\ extended-length path prefix?
> http://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx#maxpath
>> Hi,
>> The Windows 64 bit systems allow file names>   256 characters.Our Zip gives 
>> message that file is 'Open'.
>> Sorry I am not able to test this situation at my end currently, therefore I 
>> am asking you without trying out the latest Dll's.
>> Please Advice.
>> RegardsAllan
>
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