Make the extension

since 2023/05/14, if i save a mp4 or wav, the name on disc has not the
extension mp4 or wav

Saving is writing the project file to an mlt extension.
shotcut_2023-06-11_12-25-19

Exporting by default:
shotcut_2023-06-11_12-24-21

Exporting selecting the WAV preset:
shotcut_2023-06-11_12-24-50

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It is working for me whether I use a preset or change format in advanced mode.

i clicked on the preset and than export. the format of the file is that specified,
but the name has not the extension. *.mp4

Maybe a silly question, but what about the other files on your computer?
Do they display their extensions?
Maybe you inadvertently disabled the display of file extensions in your folders.

ShareX_74kt0Umagb
(open this GIF animation in new tab to see it a 100%)

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no this is only on saved shotcut-files.

now it happens not always on 1 hour of working that the extension mp4 is there and next file not.

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