Creating New File Types...

I recently created a new "File Type" for file extension "H" (C source header files) and changed the "Open with" setting to that of my favorite text editor. Now, as expected, my "H" extension files have my text editors icon next to their names and when I double-click on an "H" extension file, the file opens in my favorite text editor. All good so far.Next, I created a new "File Type" for file extension "C" (C source files) and changed the "Open with" setting to that of my favorite text editor. When I double-click on a "C" file, the file opens in my favorite text editor as expected, however, the "C" files icon has not changed to that of my text editor and when I close & re-open the "File Types" dialog I do not see the "C" extension entry at all.