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Editorial Team
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Asked: 2026-05-23T07:58:03+00:00

Is there a possibility to unblock a file that is downloaded from the internet

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Is there a possibility to unblock a file that is downloaded from the internet from within a c# program.
Surfing the internet I have learned, that the information is written in an alternative stream of a (NTFS) file that contains the current zone information (value 3 is from the internet and is interpreted as blocked).

Is there a managed possiblity to either clear or change the zone information (unblock) of a file or is there a managed copy function that copies the files without the zone information?
If not, how can I do with PInvoke but without including a foreign assembly (I’m not allowed to do this in a current project).

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1 Answer

  1. Editorial Team

    It’s stored in the :Zone.Identifier stream (more < c:\theapp.exe:Zone.Identifier) you need to use the native IO routines to manipulate them, here is a managed wrapper.

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