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In a file's properties dialog you know that message This file came from another computer and may be blocked...

I want a Windows 7 search query to find files that came from other computers, and files that came from this one. For instance looking for a code snippet javascript onclick type:.js date: earlier this year <file made by me>. Unless I somehow exclude the various program files that match the query, I get too many irrelevant result.

I can't search for author: because it's not a good proxy (files either don't have that metadata or my author name isn't constant over the years).

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You can use PowerShell for this. Files originating from the Internet have an alternate data stream called Zone.Identifier. As of PowerShell 3.0, Get-Item supports the -Stream parameter, which allows viewing of ADS. If you're running Windows 8, you should already have a capable version of PowerShell built-in. If you're on Windows 7, you'll need to download an update from Microsoft's website. The latest version is currently PowerShell 4.0.

Once you've got a capable version of PowerShell installed, the following command will list all files in the current folder (and subfolders) which have the Zone.Identifier ADS:

Get-ChildItem -Recurse | Get-Item -Stream Zone.Identifier -ErrorAction SilentlyContinue | Select-Object FileName

Expanded, with comments:

# Get all items in the current folder and its subfolders.
Get-ChildItem -Recurse|

# Get the Zone.Identifier ADS for each item. Suppress error output.
# Errors are suppressed here because otherwise the screen will fill with non-critical errors for all the files that *don't* have the Zone.Identifier ADS - i.e.: Files that aren't from the Internet.
Get-Item -Stream Zone.Identifier -ErrorAction SilentlyContinue |

# Display only the FileName property of each object returned.
Select-Object FileName

"Golfed" version:

ls -Rec|gi -S Zone.Identifier -ErrorA SilentlyContinue|select FileName
  • ls, gi, and select are built-in aliases for Get-ChildItem, Get-Item, and Select-Object, respectively.
  • -Recurse, -Stream, and -ErrorAction were truncated to the minimum length required to uniquely identify the parameter names.

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