We use PHP on IIS, the initial install was via Web Platform Installer but to keep up with the current PHP releases I manually install new releases then use PHP Manager to switch IIS to the new version. This process works pretty well except that IIS seems to have a default list of extensions which are automatically enabled when I install a new version; where is this list stored and can I change it?
The problem is that it includes old extensions like mysql which are no longer even present in PHP 7, so when I switch to a new version I immediately get an error until I have disabled the obsolete extension.