Experimenting here on Windows 7, there may be a difference.
When I added txt files to NoteTab's Associations list, they did open with NoteTab but the file icons were unchanged.
When I used Windows "Open With" command and selected the checkbox for Windows to "always use the selected program...", the file icons changed to use NoteTab's Swiss cross icon.
--- In email@example.com, loro <tabbie@...> wrote:
> tuttle.grey wrote:
> >Are there any differences in behaviour or results from using one
> >method versus the other? Is one method preferred for some reason?
> I can't think there is any difference. I suppose Notetab and other
> programs that offer an easy interface to file association do just
> that, offer another interface to the Windows settings.