Programs enabling conversion of the file:
If your objective is to convert the file from GDOC to the file TXT, you can use any of the applications listed. GDOC to TXT conversion process in every program intended for this purpose (so-called converters) is very intuitive and everyone is able to manage converting a file.
However, bear in mind that the list may also include programs to support and work with the indicated extensions GDOC and TXT - and not only converters. In such a case, you need to open the source file GDOC and from the options available in the program, choose ”Save as... TXT" or "Export to TXT".