On a real computer such as a Mac or Windows system, simply use the copy facility within the Finder or Windows Explorer to duplicate a file. There is no good reason to open the file to simply duplicate it!
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- Dov Isaacs, former Adobe Principal Scientist (April 30, 1990 - May 30, 2021)
Plenty of reasons to duplicate. Maybe I want to duplicate a file because majority of contents can me used and saved under a different name for different client.