Hello!

I discovered that tuned by default "delayed type check always" option makes
non html files redownload. At least that happens when these files were
downloaded before with some other software. When httrack prepares to download
a file its name becomes something like myfile.a1.delayed and this name is used
to check for file existence on the file system. So it always fails and
overwrites the file. Using %N1 option solves this problem. Though it took me
some hours to solve it including looking into the sources, adding some debug
and compiling :)