Please note that, path like C:/Program Files/ImageMagick-7.0.8-Q16 can cause problems on Windows environment because of space betweenProgram and Files. I have seen this issue with Windows 7, not sure about Windows 10.
So, better to install image magic in any folder which doesn't have spaces within their names.
In custom installed image magic also you should see modules/coders at similar path as mentioned above. The folder is available in version: ImageMagick-7.0.5-Q16. I am not sure about your version you have installed.