I'm hoping there is another way becuase even though Apprentice is much faster than Inventor, it's still far too slow when you are using it read thousands (perhaps tens of thousands) of files (to display in a ListView in Detail mode [grid] or DataGridView control). I don't need to load up all the entire file (i.e. sketches, features, sheets, views, the list goes on and on), I just need its iProperties. What I really need is for Autodesk to develop and maintain an app (a DLL perhaps like DsoFile.dll) so programmer can do large scale data retreival that is extremely fast so the user isn't waiting too long (right now it's way way too long). I can't image this being difficult for Autodesk to do because they know the file struture and how to pull what is needed but perhaps they don't want to maintain such of an app but maintainance from one version to the next is most likely minimal. Heck, Autodesk I'm sure would even utilize for the new app I'm proposing for some purposes (e.g. displaying the thumbnail in the Open dialog).