how to force  image file and music file  to download with zip format in drupal 6? i have content type to upload music and image files.i want to provide a link to the users to download those music and image files.By using force download module , i can provide the download link for the file ,but now i want to zip the file when user click the download link and so user can download the image or music file in zip format.

i have installed the pclzip module and custom formatter module and i think we can achieve this by creating custom formatter for those cck field,but i dont know how to implement it? or any other module suggestion?  thanks in advance.
I'll answer with a question, do you want to make a zip file because it's an easy way to force browser to download the image or the mp3 instead of showing it ?

If so I'll recommend you the File Force Download module to achieve this. Also you have DownloadFile module and a .htaccess way to do this: Force Files to Download Instead of Showing Up in the Browser but I don't find this one to be very flexible.