At 8/4/2015 13:18, you wrote: >I use gmail and just did a test. I tried to send a zip file as an attachment >to another account and got an error message from System Administrator >"Undeliverable:zip". However I took the same file and renamed from file.zip >to file.txt. I sent that as an attachment without problems, saved the >attachment from the incoming message, renamed it back to file.zip and it >automatically opened in Windows File Explorer. > >So you could send the file that way. The suggestion above will work. However, it is possible that the recipient may try to open the file before reading the message instructions. Opening a ZIP file in a text editor in itself is probably not going to cause harm to the file if the file is immediately closed without any changes being made. But even and inadvertent key-press can damage the file and make it unreadable by the compression program. The idea is still sound, but instead, I would suggest changing the File Type to something different like ABC or XYZ. This would likely to cause the recipient's computer to display a message that it does not know how to open the file making the recipient go back to the message and reading the instructions. Lee Hoffman/KY