Hello,
I' am a Joomla / VirtueMart Newbie, but I hope, I have found just a little bug in your great work. ;)
In mediahanandler.php function getUrl() at line 246 I found:
return $this->file_url_folder.$this->file_name.$this->file_extension;
I replaced it into
return $this->file_url_folder.$this->file_name.'.'.$this->file_extension;
I think thats the way you want it, cause the other functions getThumbUrl() etc. follows this schema.
Happy Christmas und Success in 2012
Giant