We have found one software suitable in our database for this conversion.
Both .gdoc and .gdocx files are used by Google Docs, but neither of these are actually documents, just links to them, which means that gdoc to gdocx conversion is not possible. What you can do is to access the document through the link and convert that and even make a new link for that new document, but that's pretty much it.
Updated: October 16, 2023
GDOC
Files with gdoc extension are URL links to a document created in Google Drive. It is not the actual document, just link. You can download the document from Google Drive in more typical format, like docx or odt.
GDOCX
Files with gdocx file extension are URL links to a document created in Google Drive. It is not the actual document, just link. You can download the document from Google Drive in more typical format, like docx or odt.