Engine.LastWorkspacePath
Specifies the pathname of the workspace file that was open when the sequence editor last shut down.
When the sequence editor shuts down, it sets this property to the pathname of the current workspace file. If there is no workspace file currently open, the sequence editor sets this property to an empty string. If StationOptions.ReloadWorkspaceAtStartup is set to True, the sequence editor loads the workspace file specified by the last workspace pathname.