Have you been unable to locate the files we're asking for, or where the respective folders where they are stored empty?
Currently the forums don't have a hosting solution (the previous vBulletin forums did, but this platform is at an early stage still), so you'd need to host them somewhere else such as dropbox and link us to it.
Instead of registering the cd key through the website, you can now directly link your Steam account to your forum account in your profile: https://www.games2gether.com/profile/me
(this only allows the forum to look at which of our games you own and which achievements you have reached)
As for your original question, sometimes we don't need said files to correct an issue, but it's a lot easier to ask for them upfront even if we're not sure they'll be needed, than to try and track a player down when they haven't been uploaded and are required. It all depends on the issue that is being reported. :)
Hope this helps.