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 )