cfcontent and macs

I'm having problems with cfcontent and mac users.
I have created an image lightbox where users can add to and then download their lightbox as a zip file. This works fine if the end user has a pc, but will not work correctly if user has a mac. Have tried various mimetypes, but a mac will not name the download file to *.zip, it defaults to the name of the template zipfile.cfm. sometimes it downloads the actual cfm file, sometimes it downloads the zip file, what I dont want to do is ask the user to rename the file type to .zip.
what i wish to happen is that the .zip file is downloaded and given the correct name, (in this case new_download.zip)

any ideas would be appreciated

You should be able to do it with something like this, but unfortunately each combination of OS and browser has the potential to handle it differently.

<cfheader name="Content-disposition" value="attachment; filename=myfile.zip">
<cfcontent type="application/zip" reset="No">

thanks for your response kiteless.
have tried your suggestion along with changing attachment types unknown & inline, and different mimetypes including unknown, but nothing works.
i'll just keep trying, one day i may get lucky......
thanks again....