photospot_scripter,
This seems to work in CC
var meshFile = new File('~/desktop/Liquify.msh');
meshFile.open('r');
meshFile.encoding = 'BINARY';
var desc4 = new ActionDescriptor();
desc4.putData( charIDToTypeID( "LqMe" ),meshFile.read());
meshFile.close();
executeAction( charIDToTypeID( "LqFy" ), desc4, DialogModes.NO );
And it works with both a normal artLayer or as a smart filter.