It gets worse. I have a shocking blind spot. I think that I have missed the train completely. You seem to say that I have to take one of theses files and put it somewhere else. Put it where ?
I just want to tell you what I've been doing so we are on the same page. I have selected a package from Packagist, call it smith/jones. Then, using the W 10 command prompt I have gone into \wampstack...\php> and entered the composer instruction ..>composer require smith/jones or what ever the Packagist instructions told me to write. After this, I have noted that \PHP now has a folder called vendor and that it has a sensible looking .json file in it. I then copied this folder vendor into apache2\htdocs and I have then added a suitable index.php to apache2\htdocs. Finally I call up the application by writing http://htdocs/index.php. I assumed that at this point apache2\htdocs had all the information needed and that if everything worked I would then use my FTP tool to move index.php and \vendor to the external server.
I have not copied any files like php.ini-production to any other folder.