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Microsoft Resource Kits - Windows 2003 Resource Kit

Custreasonedit.exe  (Windows 2003 Resource Kit)

The Window Server 2003 Resource Kit is a set of tools that system administrators and engineers use to manage or support a Windows Server 2003 system. Use it to streamline management tasks such as troubleshooting operating system issues, managing Active Directory, configuring networking and security features, and automating application deployment.
Custreasonedit.exe - Custom Reason Editor
Removes the reasons listed in the event shutdown tracker dialog box.
Switches: /i - To use interactive dialog (GUI)
/l - To list existing shutdown reasons
/e fn - To export the custom reason key to file fn
/r fn - To import key file fn
/m host - Set initial target machine
/s - Specify to use system locale for custom reasons