Google Drive Spreadsheet file unrecognized by Thunar

[koken]

Clicking on a Google Drive spreadsheet (mybudget.gdsheet) doesn't open up the Google spreadsheet.

Instead it opens up to a text file in the browser containing a "url" statement, like: {"url": https://docs.google.com/spreadsheets/...."

The file manager recognizes it as a "plain text document".

How can I get it to recognize it as a "Google Spreadsheet?

Thanks!