Cartweaver allows very handy way to add new file types and modify the max file upload size.
In order to do so please follow the below steps.
Go to Admin -> Site Setup -> Download Settings
In the options you will see 'Allowed File Types' & 'Max File Size in (KB)' you can add new files types and modify the upload size to your need.
Important note: In order to add new file types please make sure that are listed under your online server MIME types.
