@Dominique DUCHEMIN
Thank you for posting in Microsoft Q&A forum.
I can't see the path of the ofc file from your screenshot, but I can see the mux file are from corrupt folder.
Usually, we can delete the file under corrupt folder without any issue.
However, it is a good practice to instead move the files to a temp folder long enough (a day or week) to make sure there are no negative repercussions from the file removals.
You may refer to the article for more info:
https://learn.microsoft.com/en-us/archive/blogs/michaelgriswold/clean-up-your-inboxes
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