The assembly to be copied can be opened in two ways:
1. In the Autodesk Inventor environment by starting the Assembly Copier command when any assembly is currently open. Upon launching the command, the current assembly is read for copying.
2. By clicking the assembly opening button. 
In this case the user is allowed to choose any Autodesk Inventor assembly from the disc. The content of this assembly will be read and the user will be able to perform the copying/renaming procedure for this assembly.