The Registry obtains the EXE location + the process class starts the EXE + parameter to enable the EXE to open the specified file

  ///   <Summary>          ///  Start the CAD of the Local Machine and browse the DWG diagram in the CAD.  ///   </Summary>          ///   <Param name = "path">  Cad.exe location  </Param>          ///   <Param name = "dwgfile">  Full path of dwgfile  </Param>          Public  Void Startcad2004 ( String Path, String  Dwgfile) {PROCESS p = New  Process (); p. startinfo. filename = Path; //  Start CAD of the Local Machine P. startinfo. Arguments = Dwgfile ;//Set the DWG file to be opened by CADP. Start ();////Start CAD of the Local Machine}  ///  <Summary>         ///  Obtain the CAD path  ///   </Summary>         ///   <Param name = "path">  CAD location read from the Registry  </Param>         ///   <Returns> </returns>          Public   Bool Getcadpath ( Out   String Path) {path = ""  ; Registrykey key_localmachine = Registry. localmachine;  //  Registrykey key_cad = key_localmachine.opensubkey ("Software \ Autodesk \ AutoCAD \ r16.2 \ ACAD-4001: 804 \", false );  //  Cad2006 Registry address  //  Registrykey key_cad = key_localmachine.opensubkey ("Software \ Autodesk \ AutoCAD \ r16.0 \ ACAD-201: 804 \", false );  // Cad2004 Registry address  //  Any version of CAD is startedProgram              /*  This value features "EXE" "DWG file "*  */  Registrykey key_cad = Key_localmachine.opensubkey ( "  Software \ Classes \ applications \ acad.exe \ shell \ open \ command  " , False  );  If (Key_cad! =Null  ){  String Cadpath = key_cad.getvalue ( "" ). Tostring (); //  Get startup path Matchcollection MC = RegEx. Matches (cadpath, "  \"(? <Cadpath> .*)\"  " ); //  Only the first acad.exe path is obtained. Cadpath = mc [ 0 ]. Groups [ " Cadpath  "  ]. Value; Path = Cadpath;  Return   True  ;}  Return   False  ;}