I can't see a lot of use for this as a webapp.<p>If I were going to use this, I'd want it where my unrecognized files are. If you could connect this to a right-click in my filesystem, or have it as a browser extension that intercepts downloaded files and tells me what they are (ie: built into firefox's download manager, or the download bar at the bottom of chrome). Or get it to interact with my email somehow. Next to attachments, have a link saying "what is this?".<p>Not sure if any of those are actually possible, but that would upgrade your side-project from a "cool idea" to something that I would actually use.