MIME Types
MIME types are a standard way of identifying the file or content types recognized by your system. MIME stands for Multipurpose Internet Mail Extensions, based on its origin as a way to identify file attachments to e-mails). A MIME type has two parts, a type and a subtype, separated by a forward slash. By configuring MIME types, you can control the types of attachments users can upload into the system. You can also use this as a way to reduce the chance of malicious attachments such as executables.
As delivered, all MIME types are active. You need to review the MIME types to determine what is applicable for your organization.