How do I load big PNG files and Jpegs? I know you can, but what's the mod for it. Please someone tell me

You can not load jpegs only png
And for big card if it card it load normaly if not then it troll screenshot

Download paint.net, it's free. There are others as well, all free, ACDsee is another. To reformat vids use Handbrake, also free.