The Dink Network

It depends on what you want exactly. The title-01 file is just a sprite that is placed on the screen, so you'll have to place it like a sprite. Since the file you have is not a full 800x600 resolution you'll first have to select the background color (because the title is not going to fill up the entire screen). By default this background is black:

fill_screen(255);

This is the code that places the title screen on the screen:

&dinklogo = create_sprite(426,344, 0, 453, 1);
sp_que(&dinklogo, -800);
sp_noclip(&dinklogo, 1);

The exact position can be modified by choosing different x and y coordinates (426 and 344 by default).

EDIT: You could also check out the scourger, it also has a title screen less than 800x600. At the time I didn't see the point in making a huge black sprite if you could get away with only using 13% of it...