You can work around the issue by doing the following: This means that all files you attempt to extract are subjected to additional processing by the operating system and that files not blocked by Windows are extracted with the same Zone information as the Zip file. Since Zip files are not (at least, by default) considered to be "high risk" by the operating system, they are not themselves blocked but, as they can serve as a vehicle for files that are considered "high risk" and, as WinZip is Attachment Manager aware, it honors the presence of the alternate data stream, if it exists, on the Zip file and passes it on to Windows for files you attempt to extract. When you download files from the Internet or receive attachments via Outlook or Windows Mail, Windows creates an alternate NTFS data stream for the downloaded/received file which contains Internet Zone information which is used by the Attachment Manager in determining how the file should be handled (e.g., whether it should be blocked altogether or be allowed to be opened with warnings, etc.)
Starting with WinZip ® 10.0, the Windows Attachment Manager service slows the WinZip extraction process significantly. Why is WinZip slow when extracting some files?
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