We have found one software suitable in our database for this conversion.
Whenever you import a document (in this case MS Word .docx file) to Google Docs documents, a new .gdoc link will be generated on your computer that represents quick access to the document uploaded to Google Docs. There is no other way how you could generate a valid .godc file.
This is actually no conversion, and a .gdoc file does not contain your document, just a link (shortcut) to it.
DOCX
Files with docx extension are documents written and saved using Microsoft Word word processor edition 2007 or later. DOCX format replaced the previously used DOC format, moving from binary files to Open XML schema-based documents. They are supported in almost every modern word-processing tools.
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.