Zone identifier files are also known as "alternate data stream" (ADS) files, since they are only used to describe other files. They have the same filename as the original file, followed by a colon and the text "Zone.Identifier." For example, the file "download.exe:Zone.Identifier" may be saved along with a downloaded file named "download.exe." - Fileinfo.com
Quickpost: Zone.Identifier - Didier Stevens
Alternate Data Stream
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