I really appreciated your detailed help with this, however it still doesn't want to work.
I followed your instructions to the point inc. re-downloading the full bitnami wordpress stack (Windows 10 v4.9.8) and I still can't get my installation to enable the imagick module.
I downloaded the recommended php_imagick.dll file into the /php/ext and added the following to php/php.ini
But this didn't result in this extension showing as enabled on php_info.
I know I'm working with the correct php.ini file as I can disable the other modules by commenting them, e.g.
; extension=php_gd2.dll ;Disables gd2
I also double checked the recommended php_imagick.dll file matched up with the version of php installed on the bitnami stack.
PHP Version 7.0.31
And it does all match up but it still won't enable imagick.