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by falsissime 1239 days ago
The 1978 DEC10 Prolog user guide mentions PROG.PL as an example of a Prolog file with an extension. See 3.2 in https://userweb.fct.unl.pt/~lmp/publications/online-papers/U...

Maybe the 1975 Prolog I manual has more to say...
1 comments
eesmith 1239 days ago
Good work!

I think it's even more explicit on p25 where it says "A module name can have the form either file.ext or just file. In the latter case the extension 'PL' is implied."

link