How to remove Linux permissions on files for emailing to a Windows user

A friend needed some help with LaTeX so I created some files, zipped it and mailed it. My friend (who is running Windows 8.1) could open but not edit the files I sent, due to write-permissions. I suggested creating a new file and manually copying the contents over. I consider that a nasty solution. Is there a more elegant way to handle files being transferred from a Linux system to a Windows system?