I was also going to suggest xzip.dll from www.xstandard.com I've tried it recently by Frank Cazabon advice.

>If you are interested in checking out alternatives to WinZip, we have had very good results for several years using a freeware command-line zip/unzip tool called info-zip. http://www.info-zip.org/
>The version we use has worked so well for us that we haven't even bothered to download a newer version since about 2000.
>
>>Is it possible to configure WinZip so that it does not complain about files that are open when it is trying to zip them?
>>
>>I want to zip a directory which is, essentially, read-only -- once created, it is not modified. There are probably users accessing the files almost 24 hours a day. I'd like to use Zip Automation Manager to zip this directory (so that it can be transferred over to laptop), but get a message which looks like this (for every file):
>>
>>Warning: The following file is open by another program. If that program
>>Warning: writes to the file while WinZip is zipping the file, the zipped
>>Warning: file may be corrupt: ..\..\..\Data\Kong\KOIN\deleted customer parts.dbf
>>
>>Is it possible to change some configuration setting so that Winzip will not complain about this problem?
>>
>>Thanks,