Thank you do your reply Dana.
The site is over 10 years old, however the URL schema was already updated just over a year ago to the URLs I mentioned above.
Before that, everything was from the root...for example:
http://domain.com/article1234.html
http://domain.com/download1234.html
From a SEO standpoint, do you think that updating the URL structure will be beneficial? I.e. is it really worth it? Are we missing out on organic traffic with the current scheme? And would it be worth changing? Or could we get on just fine without changing anything?
Thank you for your suggestions and comments.