Normal Emulators
>Open
>Load file

Retroarch
>Open
>Load Core
>Scroll through thousands of useless cores to find the one you want
>Select
>Load Content
>Select start directory
>Then navigate through a folder
>And another
>And another
>Finally find the rom you're looking for
>Select it
>Load Core AGAIN
Now it st- oh wait nope sorry hold on forgot this
>Controls messed up for some reason
>Open quick menu (hope you know how to)
>Find controls (hope you know how to)
>Press every single button
>Realize this is a waste of time when it doesn't work
>Delete Retroarch, boot up a real emulator
>Open
>Load File