> The function usercommand() (in htscore.c) which 
calls 
> the 'save-file' callback is called for non-HTML 
files 
> even if they are not re-downloaded.

Right.. I'll add an additional wrapper for that, this 
is the only way I see

>The behaviour is different for HTML files. The 
>usercommand() function (and thus the 'save-file' 
>callback) is NOT called when an HTML file is not re- 
>downloaded. Is this different behaviour for HTML vs. 
>non-HTML files done on purpose? 

Yes - this is due to the md5 check (the file won't be 
written if one file already exists with same md5)
I'll check that, too!