cannot open mp4 files

[Ronald20]

I am unable to open mp4 files

[Prométhée]

Hello
We should be a little more precise!
But not all readers are suitable for opening this type of file
Try VLC it can read several types of files

https://www.videolan.org/vlc/index.html

https://support.microsoft.com/en-us/help/4050842/windows-10-how-to-play-mp4-files

[Ronald20]

Without downloading more software I figured it out on my own.

So much for help from the community .

All I got was sarcasm from the computer Geek Promethee," We should be a little more precise!"
"But not all readers are suitable for opening this type of file "

Too bad that you don't live up to the screen name that you have chosen, Promethee.

I wouldn't have asked for help if I was more computer savvy.

I clicked on the file & clicked on down load & then was able to open it. The only inconvenience is I had to go back into downloads & delete it if I didn't want to save it.

I hope this helps other novice PC users.

[Prométhée]

Sorry, but not at all!
If you do not know exactly what the problem is, you can only answer vaguely!
If I say for example
"my car, don't start", what to think?
It can be anything and everything!

https://h30434.www3.hp.com/t5/custom/page/page-id/hp.rulespage

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1. Be respectful. Respect your fellow users by keeping your tone positive and your comments constructive. Good or bad, your experiences are always welcome as long as they are offered in a courteous way. Respect people's time and attention by providing complete information about your question or problem, including product name and model number. People like helping those who ask good questions.

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Still sorry, but I come from the French Forum, and it is not easy to try to help, by being obliged to use a translator