I did some quick tests, comparing three files:

1. Zip file generated by MBS
2. Zip64 file generated by MBS
3. Zip file generated by OS X Finder (which I believe uses 'ditto')

Using the Zip format specification 
http://www.pkware.com/documents/casestudies/APPNOTE.TXT

The files have differences, particularly in the Version made by (VMB) field:


Kind   VMB   Comment
----------------------------------------------
Zip    0014  14 hex = 20 decimal = version 2.0
Zip64  002D  2d hex = 45 decimal = version 4.5
ditto  000A  0a hex = 10 decimal = version 1.0


If I take the zip64 file created by MBS, and change that one byte (from a 002D 
to 000A or 0014), then the Finder properly handles the file.

I'm not sure what to do about this - it looks like it's a bug in the Finder, 
since the "version 4.5" field appears to be technically correct. 




On Jun 3, 2014, at 1:01 PM, Michael Diehr <[email protected]> wrote:

> I just tried it, and it seems the same problem reported a long time ago by 
> David Glass.  I'm seeing the same thing in 10.8.5:
> 
> "Developing with RS 2011r3, on 10.6.8, with MBS 11.2.
> 
> When I create a zip file (ZipMBS.CreateFile) I'm experiencing the 
> following results from the file created:
> 
> Application running on 10.6.8:
> Zip64 = True - the zipped file expands to a .gczp file which expands to 
> the original zipped file which expands to a .gczp file, and so on."
> 
> 
> On Jun 2, 2014, at 3:02 PM, Christian Schmitz 
> <[email protected]> wrote:
> 
>> 
>> Am 02.06.2014 um 23:31 schrieb Michael Diehr <[email protected]>:
>> 
>>> Hi Christian,
>>> 
>>> Does the Zip64 support in the ZipMBS classes still not work?  The 
>>> documentation says 
>> 
>> I thought I fixed those little problems.
>> 
>> Did someone try recently with 14.2 plugins?
>> 
>> Sincerely
>> Christian
>> 
>> -- 
>> Read our blog about news on our plugins:
>> 
>> http://www.mbsplugins.de/
>> 
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