i haven't used WinHTTrack in a while and I was wondering 
if you have solved the issue of the app keeping a 2nd copy 
of nearly every file for update checking?  You once said 
this was neccessary for fast reliable updates but 
metaproducts Offline Explorer done away with these some 
time back and having just tried the trial I can say theat 
it works like a dream.  Can you not use a similar method 
for your app?
Tom