Oh man, sorry. The resizer only resizes 2d pits. 3d pits don´t need to be resized, as they resize themselves autopmatically according to the resolution.
The 2 files you need to resize are the 10_ckpit.dat and the 10_plock.dat.
Unfortunatly, my program does not resize the gfx(only 2d dat files), which is no small task.
I have a 800x600 pit working quite good tho. You can grab it here.
http://www.vod.dcc.ufmg.br/~mribeiro/SP ... 00v1.1.zip
There are some minor bugs, but hey, it works =)