MP4 don't play at Slide-Show

[DennyHei]

i need the classic-version because the mp-version can not create slide-show how i need it

i have a second laptop (Win 11 Home) where the video in mp4 don't play and xnview shut down, i have installes the k-lite-codec-pack

is there another codecs i need?

my old laptop works with the mp4-videos but this laptop is old and big videos play only slowly...

thx for help!