Zip file corrupt

Hello, I tried many times to download zip file from my site.
1) I created folder and put MP4 file inside
2) I zipped it by using winzip
3) I save it at the root directory
4) I created a link to https://mysite/download/?f=file.zip
5) I download it on my computer. I got a error msg that the file got corrupted when I try to unzip it.

I know the zip file was good before upload to the server(many tests). Please advise?

thank you

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