Hi, I want to disable all file extensions except one extension.
For example, I want to only allow .zip as the file extension of attachment, disable all other file extensions. How can I fulfill it?
I had read this document for 3 times, but I can not figure out how to do it.
http://www.jforum.net/confluence/display/admin/Extension+Groups [originally posted on jforum.net by David Lee]