I am looking for some directions to achive the same.
I did it sometime ago, but nor for ArcGIS, for Manifold GIS. Anyway, we had to write some code to transform the pas file into something readable (a associative array of points of lat and lon) and then import those points.
The same thing can be done for ArcGIS Server.
I don't have the code right know, but I'll look later and come with a precise answer
I have developed a widget for flex Viewer that parses the .pas file. You can find the widget and code here: