> I want to download some files that one can download only 
> manualy. The website demands that you rigtclick 
mousebutton 
> at a file and only then you are able to download it (with 
> save target as). Files are listed 
> as .../domain/something.exe?name.arj.

Did you try to add: 
+*something.exe* 
in 'Set Options'/'Scan Rules' ?+*something.exe*