Windows uses a feature called Mark of the Web, often shortened to MOTW. It helps protect your system from untrusted files. You encounter it when Windows warns you before opening a downloaded file.
What Mark of the Web is
MOTW is a small metadata tag stored with a file. Windows saves it as an alternate data stream named Zone.Identifier. The tag records where the file came from. Common sources include the internet, email, or a local network share.
What MOTW is used for
Windows security features read this tag and change how the file behaves.
- Shows the This file came from another computer warning
- Triggers SmartScreen checks on executables
- Forces Office documents into Protected View
- Blocks scripts and macros by default
- Adds extra prompts before running installers
Zone values matter
Each MOTW tag contains a ZoneId value.
- Local machine
- Local intranet
- Trusted sites
- Internet. This is the default for downloads
- Restricted sites
Most files downloaded by browsers get ZoneId 3. This is why Windows treats them as risky.
More in depth write up can be found here
Why MOTW can be a problem
MOTW improves security, but it can slow down workflows.
- Internal tools trigger warnings even when trusted
- Archived files pass MOTW to extracted content
- Build pipelines fail when scripts stay blocked
- Administrators waste time unblocking files manually
You often see this in enterprise environments and developer systems.
Introducing MotwTool
MotwTool is a command line utility that adds or removes Mark of the Web on files. It targets speed, automation, and clarity. It is developed by FNOWare Software.
MotwTool requires .NET 8 to run. Install the .NET 8 runtime before using it.
What MotwTool does
MotwTool lets you control MOTW at scale.
- Add MOTW to files that lack it
- Remove MOTW from trusted files
- Set a specific ZoneId when adding
- Process folders recursively
- Exclude file types you do not want to touch
How you use it
You run MotwTool from a terminal. You point it at a file, a wildcard, or a folder.
Examples in practice
- Clean a downloads folder after malware scanning
- Prepare build artifacts before packaging
- Remove MOTW from internal tools copied from file shares
- Apply ZoneId 2 to files from trusted internal sites
Behavior and exit codes
MotwTool uses clear exit codes so you can script around it.
- 0 means success with no changes
- 1 means success and at least one file changed
- 2 means an error occurred
This makes it suitable for CI systems and admin scripts.
Why MotwTool exists
Windows relies on Mark of the Web (MOTW) as a critical security signal. It determines whether a file is treated as trusted or untrusted and directly affects SmartScreen warnings, script execution, macro behavior, and application blocking. Despite its importance, Windows provides no efficient built-in way to manage MOTW at scale.
File Explorer only allows MOTW to be added or removed one file at a time through the file properties dialog. This approach does not scale and is impractical for real-world administration tasks. PowerShell solutions exist, but they are often slow, verbose, difficult to audit, and poorly suited for high-volume or repeated use in automated environments.
MotwTool exists to fill that gap.
It is designed for Windows administrators, build engineers, CI/CD pipelines, and software distribution workflows where large numbers of files must be handled quickly, consistently, and deterministically. MotwTool provides a fast, native, command-line solution for adding or removing MOTW across files, folders, and directory trees—without the overhead of scripting engines or GUI interaction.
If you manage Windows systems, build artifacts, installer packages, or downloaded binaries, MOTW matters. It can block execution, break automation, and introduce unexpected security prompts. MotwTool gives you direct, explicit control over MOTW behavior so that you can apply security intentionally—rather than reactively.
MotwTool is simple by design:
- No dependencies
- No scripting runtime
- No guesswork
- Just fast, predictable control over Mark of the Web
That is why it exists.
Installation
Download it by clicking the icon below and unzip the content in a folder of you choice and add the path in windows for universal access.
