I just upgraded ampps to 3.6 and all is good except when I change php 7.
The CMS I'm using, Craft, requires PHP multibyte string which I've enabled via the extensions option and also checked by opening /php/php.ini and I can see it there.
extension=php_mbstring.dll
I also tried adding the following to php.ini but it didn't make a change and I've removed it.