No I dont think so, and about the config file I dont really need it to do that my screen has this option of streching everything to 16:9 but it sucks.
I found only one true mod for heroes 3 that turns the game to full hd, but no luck with the others.
Almost certainly because the mod makers figured out how to make it understand a ratio beyond 4:3.
If the game does not, your computer just stretches it.
And can we dispense with labeling everything widescreen as "HD"? They are not synonyms.