The InventorPreview program now has added support for Inventor R6.  It now requires that you have either Inventor installed on your computer or Apprentice Server installed.  It still supports older versions of Inventor.
To install, you need register the dsofile.dll.

You might try running the program InventorPreview first to see if you get an error. If it works then dsofile.dll is aready registered.  If you get and error, just run install.bat


send me an email if you need assistance
cbliss@cbliss.com