Ok here's a question that is quite a bit over my head. My goal is to: Run a simulation software called IPSEpro from Matlab in windows 7. This is possible in windows XP and I have the instruction how to. The problem: I need the progID for IPSEpro to be able to start it from Matlab, in XP i can find it in Regedit as "PSE.application". But in Windows 7 there is no such progID. I have Ctrl+F:ed my way through almost the whole registry (puh!) in hope to find anything close to IPSE/PSE/SimTech but without any luck... Any suggestions? Thanks! /Björn Additional questions generated by this problem: How do I (easily) find the progID for a process in w7? Why is there a difference in the register between XP and w7?