The layers had layer numbers back then. Which leaves me to assume that kicad back then did not really use the layer name for anything other than showing it in the layer lists inside of kicad.
I then wonder why the system to transfer such an old file forward relies on the layer name.
I changed the language and now not even open in the old KiCADā¦ the same problemā¦
Itās simple, the old version of Kicad
named the technical layers in the local languages (French, Italian, English, etc ā¦) The person who made the script in Perl had a Kicad file made with the Italian version. Which corresponded with your file. So, you are lucky. For other languages, for example in French, you will need to modify the Perl file.
Check who you answered. I am not the owner of any such old files 
so you opened my file using the Perl scriptā¦ right?
Yes, thatās what I did. You must install Perl. But made a backup, itās more careful.
Sorry for the inconvenience.
the script instead where I find it? I am installing the Perlā¦
The script is here
Sorry I had not seen that I had to expand the postā¦
The script as I put it in the project folder KiCAD? I Go from the DOS in the project folder KiCad that interests me and launch it there?
You can find the link with the āsearch topicā in the forum
Italian Convert version older than Ver 4 top right of the page.
Or click directly on the sentence in blue in my
last message.
I thank all for the informations and the help you have given me 
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