Information about the .identifier (identifier) file type

Below is all the information we have available on file about the .identifier (identifier) file type.

Zone identifier ADS.

When a file is downloaded from the internet using Internet Explorer, an additional Alternate Data Stream (ADS) may be created named using the convention:


Where "downloaded-filename" is the name of a downloaded file. This is an alternative data stream file and contains security information which can be used to determine the publisher of the file.

Because it is an alternate data stream it is not normally visible. Its presence can be seen using some tools (such as Microsoft's Process Monitor, or some rootkit identification programs). It is only created on NTFS volumes, and only on Windows systems starting with XP SP2.

The contents of the zone identifier ADS can be viewed by at the command prompt using:

more < downloaded-filename:Zone.Identifier

Substituting the real filename (and path) for "downloaded-filename" in the above.

The following link provides further information related to the .identifier file extension:

Where this is available we would like to include file format information on .identifier files, as well as information on how to view or open files of type .identifier. If you know of any information which we have missed then please let us know.