When you create a zip file from a file using the right-click Create Archive function, the .zip file extension will be appended to the end of the file. However, the old file extension will still be there. If you compressed document.doc, for example, you'd end-up with document.doc.zip. The problem with this is that some windows virus scanners interpret two file extensions as the sign of a virus, and will strip them out of any emails you send. Therefore if you plan to send the archive to Windows users, simply delete the first file extension, leaving only .zip.
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