Unblock a file with PowerShell?

The PoshCode module includes Set-DownloadFlag and Remove-DownloadFlag functions which work as advertised. :) I've just pulled that piece out into it's own script contribution http://poshcode.org/1430 ... it will work on PowerShell 1 too, if you use the New-Type function in place of Add-Type ( http://poshcode.org/720 )

If you are using PowerShell v3, you can use the Unblock-File cmdlet.

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The "blocking" part is simply an alternate data stream of the file, named "Zone.Identifier". You can display it in CMD by using input redirection (no other way to get to a stream in CMD, though):

H:\Downloads> more < test.exe:Zone.Identifier
[ZoneTransfer]
ZoneId=3

You can find them using dir /r on Windows Vista and later:

2009-10-24  12:18        54.538.056 test.exe
                                 24 test.exe:Zone.Identifier:$DATA

Also in CMD you can easily get rid of that by overwriting it (using output redirection, this time):

echo.>myDownloadedFile.exe:Zone.Identifier

which isn't quite the same as removing the ADS completely, but works in that Explorer doesn't complain anymore.

There doesn't seem to be native support for handling ADS from within PowerShell (as mentioned on The PowerShell Guy's blog here. That article also has some information how to get that functionality in PowerShell). You could, however, simply call cmd:

cmd /c "echo.>test.exe:Zone.Identifier"

That works from PowerShell as well.

Another option would be Mark Russinovich's streams utility which allows you to inspect a file's ADS and also to delete them. So

streams -d myDownloadedFile.exe

does work as well.

Oneliner to remove zone informarion(inspired by accepted answer) for all children (with correct quoting).

get-childitem -rec | % { cmd /c "echo.>""$($_.FullName)"":Zone.Identifier" }

Not strictly answer to the question, just want to make sure when I next come up with this problem there is solution already :).

PS. Works in PS 2.0