You should be able to get it using win32 API calls. I Don't have access to sdk info at the moment (I'm home now), ut I imagine borland offers some documentation on how to access those dlls. By the way, the registry key in question is: HKEY_CLASSES_ROOTpz3file It will reflect the installation which is invoked when a user opens (via dbl click or context menu) a pz3 file. I've often wondered why all the tools require you to show them where it is installed (even vue4 does this). I guess it has to do with multiple installations. If you do use the registry for this info, you probably should allow the user to over-ride that location, in case they do use different runtime directories for different projects. eric