Simple question: (I read the FAQ but it was only question of the user preferences, which does not change the colors, and all the changes I have made in the Dopus window).
How to revert to the default configuration (the state the app was at the first installation).
What are all files (with extension) I have remove and in what location:
In program files
In App data
In Local App data
To make DOpus re-open in the full default state.
I have messed up too much with the colors, settings, preferences, etc.
You can reset Preferences to the defaults using the File menu in the Preferences window. There is a menu item to reset the current page to defaults and another item to reset all of Preferences to defaults.
The main ListerMenu and Toolbar toolbars can be reset by deleting them and restarting Opus.
To reset those settings and all others (e.g. File Types and all the other toolbars), uninstall Opus (which will delete your config) and then reinstall it.
I 'll give it a try (either manually either with the download profile) when I have a moment and if I don't return within a couple of days, the thread is close.
I will also save the default profile (that's probably what the download file, on a message above, is) before to re-play with the settings and spend some time with the help file.
TAXI!... An ophthalmologist Please! 
Thanks for your very useful information just as always. 
and spend some time with the help file.