This variable is for Windows users. It is possible that the shell encoding (the things you see in the CMD window) does not match your system encoding. This can cause confusion when using special characters in logging and Shell Action/transform. You can determine which codepage/encoding your system is using by executing following command in Powershell [System.Text.Encoding]::Default. You can then use the value shown at WindowsCodePage and set the HOP_WINDOWS_SHELL_ENCODING parameter to this value.