How to remove a file extension

Good evening Océanne

You can put whatever you want before, but the last three letters after the dot cannot be removed, for example, if you have xls as the extension and you remove it, your Excel software will no longer be able to read the file, in fact, for example, you just have to put three other letters in its place, try reading it with Excel, you won't be able to, it's a bit like its name at baptism, it belongs to the Excel family.
@ +

frandan

Re good evening Océane
you can put your Excel file in a folder that you can name whatever you want
@ +