How can I load a .pst file to an instrument in logic express 9?

I have some instruments plug-in settings from my old computer that I used with logic, and I want to load them into logic so I can use them on the computer I moved them to. On any instrument I try (ES1, ES2, EXS24 and the rest) it won't allow me to load the files (.pst files) and I know I should be able to. Am I just going about it wrong or using the wrong instrument? How can I load these files so that I can use the instruments again?