Conversion d'un fichier png en icône

no, that's not necessarily true. because even if it changes the file's identity card, it doesn't necessarily change its nature, and so this manipulation doesn't work; I've already tried it.

Well indeed, after searching, installing, etc. various programs, I realize that creating an icon with ToyCon is really quite simple. Plus, you can set it to French for those who don't know the English basics. Just choose the file type of the image by right-clicking on the cardboard box of the program, like PNG>ICO JPEG>ICO, etc., then drag the icon into it, and voilà, it's done! The icon appears on the desktop ready to be used.

So a big thank you to you, Azerty10 :)

thank you so much !!!!
so I also found: ConvertIcon
THANK YOU again

To edit icons, I usually use the freeware IconEdit32

http://www.pcmag.com/article2/0,4149,4016,00.asp

There is no need for a converter for that, you just need to right-click with
the mouse button and then select properties, and in the
title bar of the file, change it to ........ tontitre.ico or any
extension. The best part is that it also works with movies and any other file.

There are some great icons:
https://www.icone-gif.com/icone/3d/divers-os/

It works perfectly as elpatoue mentioned.

Thank you

I recommend this software: https://www.softorbits.fr/batch_picture_resize/
you can transform entire folders of photos, as well as change the format, the quality, and make minimal edits.