I did that first, but tried php.ini when I kept getting the same error.
However, it turns out that I had not properly set the security settings on the directory in Windows Server 2012; I corrected them and now everything works fine.
I don't know why the system was reporting a problem with...
I have a php programme whereby clients subscribe to and download my newsletter. I charge for these newsletters, so I want to keep them inaccessible from external processes. So they're kept in a directory C:\prefletters\
My downloading procedure indicated an error, so I adjusted the php...
OK, that worked. I'm not sure what the purpose of the php settings page in Plesk is for if I have to run phpinfo() and edit the php.ini file anyway, but whatever, it worked.