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)?

Answer:

Like PKZIP 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 probably 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).

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Article ID:   W14346

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