For all those of you who are still having difficulties changing a file extension, from .dbs to .abs for example,
just follow the instructions below:-
To change the extension of a file, make sure you have view file extensions enabled, by simply doing the following:
1 .. Open a folder [any folder will do]
2 .. Click the Organize tab button.
3 .. Click the Folder & Search Options.
4 .. Click the View tab button.
5 .. Now make sure the [Hide Extensions for known file types] box is blank, ie, no tick displayed.
6 .. Click apply and then close the folder.
7 .. That's it, you should now be able to change a files extension by right clicking on the file and selecting the Rename option.