[imp] Possible bug in Zip download function in IMP

[marc ray]

> > Why can't 7-Zip open some ZIP archives?
> >
> > In 99% of these cases it means that the archive contains incorrect  
> > headers. ZIP archives contain two copies of headers. 7-Zip reads  
> > both copies and won't open archives with incorrect data in the  
> > headers. Other ZIP programs can open some archives with incorrect  
> > headers, since these programs usually read only one copy of the  
> > headers, or they just ignore errors.
> 
> Or, in other words, 7-zip is broken.  And if you don't believe me, run  
> an archive test on a zip file created by Horde on any other program  
> (e.g. zipinfo) and you will see there is absolutely nothing wrong.
> 
> michael
> 
> ___________________________________
> Michael Slusarz [slusarz <at> horde.org]

I think this may actually be a bug in IMP because both the native
 zip opener on OS-x10.4.8 and stuffit 
11.0 have issues with zip files downloaded from IMP.  
Here is the error from stuffit:

17540 An error occured within the specified format.

marc