Final answer:
This is a PowerShell script that decodes a secret message from a text file.
Step-by-step explanation:
The script provided is a PowerShell script that decodes a secret message from a text file. The script first assigns the encoded message to the variable $MYTEXT.
Next, it uses the [System.Text.Encoding]::Unicode.GetString() method and [System.Convert]::FromBase64String() method to decode the message.
The decoded message is then stored in the variable $DECODED, and finally, the decoded message is displayed using the Write-Output cmdlet.