Yes, I mean export. I'm not great with tech lingo. It's in Swedish but it basically says: "The file cannot be played It could be because the file format isn't supported, it is wrong filename extention or that the file is damaged". I think it's damaged like when you abort a download. The program was working fine before, I don't know what changed.
I get the same issue when exporting for Movie Studio 2023 and Video Pro X - it may be related to that a recent (yesterday) Windows update that was installed.
The exported file, in my case, is not damaged, and opening it using Windows File Explorer works.
UPDATE: - If the Windows default video player is Media Player try changing the default video player to Films & TV - this works for me.