Nautilus open with and Dropbox issue

I recently had an issue with file associations over Nautilus, in my Gnome desktop.

After installing the Dropbox client for Linux, I tried the «Launch Dropbox Website» and it opened Gedit with some HTML code inside (with a text editor instead of the browser !!! ).

Then I realized that when I try to open an HTML file, the application that opens it to me is Gedit.

• If you use «right button / open with» option and you check the box «Remember this application …», It seems not work.
• You need to use «right button / properties» and in the tab «open with», set the appropriate application, for instance firefox

After this, the option in Dropbox worked.