You can create your own path variables or override some of the built-in variables with the Set Path Variable(). In the following example, the path variable is called root. The variable points to the c:/ directory.
To get the value of the new variable, use Get Path Variable().
Get Path Variable( "root" );
Use your path variable as you would other variables. The following expression opens the myimportdata.txt file in the c:/ directory.