Downloaded files (if they are programs) have an about section where you can see the developer's name website.
For other files I recommend using a download manager which allows you to see the full URL of a downloaded file. In this case you can use Internet Download Manager, FlashGet, Download Accelerator or any other compatible download manager.
Well many torrent clients provide that feature... Try finding an extension for the basic internet download manager... This feature exists as an Dm extension.. You may find many such software project ideas to develop it yourself at nevonprojects.com
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