Some more info:

doit.log
-qiC1%Ps2u1%s%uN0%I0p3DaK0H0%kf2A25000%f#f -F "Mozilla/4.5 (compatible;
HTTrack 3.0x; Windows 98)" -%F "<!-- Mirrored from %s%s by HTTrack Website
Copier/3.x [XR&CO'2010], %s -->" -%l "en, en, *" www.chesscafe.com -O1
"C:\\Users\\tactictoe\\Documents\\My Web Sites\\ChessCafe" +*.png +*.gif
+*.jpg +*.css +*.js -ad.doubleclick.net/* -mime:application/foobar
File generated automatically on Thu, 11 Apr 2013 10:27:35, do NOT edit.

So, do you know what I can change in the config files or log files to make
httrack continue the interrupted download instead of starting from scratch?