•Project files have an extension of hpj and are saved by using the Project > Save HDL Project menu option. This saves the list of files that compose the current project and related simulation options. It does not save the watched signals list.

•HDL Source code files usually have an extension of v, vhd or cpp (depending on the language) and are saved by selecting the editor window and choosing the Editor > Save HDL Code menu option.

•Stimulus and Results diagram files have an extension of btim and are saved using the File > Save Timing Diagram menu option. This file saves any watched signals.