Please when I wille to unzip the file.zip, I have this message :
End-of-central-directory signature not found. Either this file is not a zipfile, or it constitutes one disk of a multi-part archive. In the latter case the central directory and zipfile comment will be found on the last disk(s) of this archive.
This means that a file has been zipped into more than one piece, and you have only one of those pieces.
Imagine a 200MB file being zipped, or compressed, down to 100MB. You want to make it easier for your friend to download, so instead of zipping it as one large file you tell your Zipping program to zip the file not into one big 100MB zipped file, but a zipped file split into four pieces - so the file is now four zipped files of 25MB each. Your friend can only unzip that file when he has all four zip files together in the same folder.
If your friend had only one of those 25MB zip files in the folder and tried to unzip it, he would get the error message you are getting.
So, you don't yet have all of the pieces of the zipped file you need to unzip it.