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Zipping and Unzipping Files Greater than 2GB

Keywords: 	  large files

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Question:

Can the Zipper extender zip and unzip very large files (like 2-4 GB)?

The 2GB limit is going to have me pulling my hair out soon as a large pile of work is coming my way and the tools I have -- I wrote them in WinBatch -- will start choking as I know the ZIP files will be growing (some in the 4-15GB range).

As drives shrink, a 2GB limit seems ancient. Is there anything that can be done to relieve this?

Answer:

You will need to update to the Zipper Extender Version 44011 or newer. The Newest Zip extender now supports the archiving of files of up to 2GB in size and archives greater than 10GB in size. These size limits may vary depending on you version of Windows and the file system.

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Older Zipper Extender Version 10010:

The Zipper Extender Version 10010 (April 29, 2003)and older is limited to 2 GB. The problem is that the ZIP file format simply doesn't support more than that file size.

Like the PKZIP to it will compress without error. However, the unzip produces the following error:

9 End-of-central-directory signature not found.  Either this file is not a
zipfile or it constitutes one disk of a multi-part archive.  In the latter
case the central directory and zipfile comment will be found on the last
disk(s) of this archive. 

UnZip DLL:  cannot find zipfile directory in d:\ziptest\bigone.zip, and cannot find d:\bigone.zip.zip, period.

This is due to the file length being held in a four byte integer field that limits the size of the file to ~2GB (signed integer) or ~4 GB (unsigned integer).

Recommended: update your WinBatch and Zipper Extender Version 44011 or newer .

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Article ID:   W14346

Filename:   Zipping and Unzipping Files Greater than 2GB.txt

File Created: 2010:03:22:10:15:32

Last Updated: 2010:03:22:10:15:32