> this is what i'm doing: before installing a new version 
of 
> WINHTTrack, i always delete previous version that is 
> already installed on my hard drive. after that, i install 
a 
> new version but then something is wrong: whenever i want 
to 
> open a project by clicking on it's icon (the one that 
> has .wht extension, e.g. myproject.wht), it opens a 
HTTrack 
> program and a pop up window with message 'file not 
> found!'... 

Even after the first launch? The registration should be 
done once the program is launched