Question: Is it safe to delete duplicate files? 

Answer: That depends on too many things to give a simple "yes" or "no" answer.  If they're your own document or image files, then sure - delete the duplicates.  However, if they're system files, it would be best not to mess with them if you're not absolutely sure it's safe to do so.
This question from the Yahoo Q&A forum is categorized in the topic: Science & Mathematics