REGEDIT4

[HKEY_CLASSES_ROOT\Word.Document.8\shell\Open\command]
@="\"C:\\Program Files\\Microsoft Office\\Office12\\WINWORD.EXE\" \"%1\""

[HKEY_CLASSES_ROOT\Word.Document.12\shell\Open\command]
@="\"C:\\Program Files\\Microsoft Office\\Office12\\WINWORD.EXE\" \"%1\""