Ciro Santilli OurBigBook.comCiro Santilli OurBigBook.com 370k114114 gold badges1.3k1.3k silver badges1k1k bronze badges 3 three it isn't really my down-vote, so I don't know. nevertheless, I'll proffer an view. Though https://medium.com/@linkdaddy/what-is-a-source-file-226b0fd56812