I am trying to do some Tool Validation for a script I'm writing in ArcGIS 10.2. I have a Multivalue File field which the user can browse to a directory to select the files they require to run. When opening the browser I would like it to automatically browse to a specific folder where the files reside so it's quicker/easier for the use to select the files required. I've looked though the http://pro.arcgis.com/en/pro-app/arcpy/geoprocessing_and_python/programming-a-toolvalidator-class.htm documentation but can't see anything related to achiving this.
Any Thoughts on if this is possible?