> WinHTTrack places dashes in filenames where a server side 
> page is captured multiple times. Is there an option to 
use 
> an underscore instead?
No, except for the next release, with use of ISO-9660 
option (_ will be used instead) - but the 3.34-alpha is not 
yet ready (maybe this week-end)

But the code will be easy to hack, too