My mp4 file turned into a weird file that I couldn't open

[Lucid]

I was finally done with my short animation tween, and when I was about to export it, it turned into a weird file. I couldn’t open the file for some reason, so I tried it again and it turned to be the exact same weird file.
I also tried to export it in different ways but it still becomes a weird file, I didn’t know what to do afterwards. I use the 1.19 version.

[bluethe_bot_academy]

did you change the name after you exported it…
if yes…try to named your project before you export it :

[Monospace]

What do you mean by “weird file”?

[bluethe_bot_academy]

i was thinking that he meant this problem…maybe??:
after export

then(maybe he named it)

then turns out

[Monospace]

Rename it and add .mp4 at the end then