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It is still possible to re-compress and encrypt a .zip or .rar file with WinZip or WinRAR.
For WinZip, please do as follows:
For WinRAR, please do as follows:
Note: Since a .zip or .rar file is already compressed, if you recompress it to a new archive, the compression ratio will not be very high, normally only 1% to 2% size will be reduced during the 2nd compression.