Checking the manual yields:
ExpandEnvironmentVars( )
Action: Expands any environment variables inside a string to the corresponding plain text value.
Syntax: EXPANDENVIRONMENTVARS ("string")
Parameter: String
The string you want to expand.
Returns: The expanded string.
Example: $Value = ReadValue( "HKLM\System\CurrentControlset\Control\Windows", "SystemDirectory")
? ExpandEnvironmentVars( $Value )
