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March 29, 2006

Why is Winzip 10 so slow?

Got this response from their support org today. Their workaround isn't a good one. You'd have to do it file by file. A better option would be to disable the use of the attachment manager or get Microsoft to speed the thing up so that it's useful. As it stands, it's just tooo slloooowwww.

The behavior you are encountering is most likely attributed to the Windows XP Attachment Manager. The Windows XP Attachment manager is used by Windows and other applications such as WinZip 10.0, to assess the risk of opening files that have been downloaded by Internet Explorer or received as e-mail attachments in Outlook Express. Files you download using Internet Explorer have a security zone (also known as a Web content zone) assignment of 'Internet zone'. Files you receive as an e-mail attachment in Outlook Express have the 'Restricted sites' zone assignment. For some file types, such as .TXT files, which are considered 'low risk' these zone assignments are basically ignored. But other file types, such as .EXE, are considered 'high risk' and in these cases, the particular zone assignment may triggers warnings in the Internet zone or may cause Windows to block the file from being opened in the Restricted zone.

Normally, .Zip files fall into the medium risk category which means they are typically not blocked from being opened but, as a Zip file contains other files that may be considered high risk, WinZip 10.0 uses the Windows Attachment Manager to determine whether files it contains should be allowed to extract based on the security zone assignment of the Zip file. Even when files are allowed to extract, the Zone assignment of the Zip file is propagated to the extracted files so that Windows can provide appropriate warnings when you later open them.

More information about the Windows XP SP-2 Attachment Manager can be found at this Microsoft Knowledgebase article:


A workaround is to unblock the Zip file. Please right mouse click on the Zip file, select "Properties" and then click on the "Unblock" button. Extraction should return to its further speed.

March 29, 2006 | Permalink


Everybody says about that button but it doesnt exist.

how can configure the attachmente manager?

Posted by: diego | Apr 3, 2006 7:09:21 PM

Thanks for the info. I've been digging into group policy and several other areas to figure out how to get a simple .exe file out of a zip file without Windows blocking it. Since the file was inside a .zip, I didn't have the unblock option. However, I had not checked the 'unblock' on the actual .zip file. When I unblocked it there, the file magically was able to be extracted.

Thanks again.

Posted by: Smokey | Apr 17, 2006 1:00:25 PM

Yes, thanks it worked for me and it was easy to find this article on google.

Posted by: kdog | Aug 24, 2006 11:24:32 PM

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