We cannot reproduce this problem, and we all using Ubuntu. This might be a change you have made to your desktop, but I cannot see how this can be. The file is clearly known to be plain text. The default editor is gedit. Can you confirm that gedit (Applications > Accessories > Text Editor) cannot open the text file.
We cannot reproduce this problem, and we all using Ubuntu. This might be a change you have made to your desktop, but I cannot see how this can be. The file is clearly known to be plain text. The default editor is gedit. Can you confirm that gedit (Applications > Accessories > Text Editor) cannot open the text file.