To open a design use File -> Open. The Open File dialog box will appear.
If the directory your file is in is not displayed, use the Look in
drop down menu for finding the directory. This line allows you to
move up and down the directory tree structures. The up directory icon
can be used to move up the directory tree. Selecting a directory in
the file display will move down the tree. When you see the file you
want to use, highlight it and click Open.
Use the design_name.ngd netlist file for examining pre-fitter designs.
Use the design_name.vm6 fitter file for examining post-fitter designs.