To change the file extension is easy, either renaming or i.e:
use File::Copy; copy("text.txt","text.html")
But note that this is not the same as to change the type of file.
So you probably want instead to convert your files to html files, and this is a different problem. Take a look to the module TextToHTML
If you use GNU the file extension is not really relevant, you could have a jpg named file.txt or file.pdf and will be perfectly recognised as image
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