Applescript or FM Script to Open files

I tried using the open URL command in filemaker to open an EPS Photoshop Image by clicking on the path name in FM and it does start to open it but craps out because it is trying to do it in Safari or IE5 for OSX. I tried a PDF with the same result. Can I invoke an applescript command from within FM that will launch a filepath in the proper creator program?

Also, in FM5.5 my filepath has to include all the information back to the Computer Name. How can I get the direct path into a field. It’s cumbersome