title: How to restrict file types of files uploaded through TYPO3 Tca file upload field?
body: <p>I have a file upload field in the TCA of an extension. I want to restrict the type of uploadable files through that field. Only "pdf" or any other document file types (Eg: doc,xls,rar,zip etc) must be uploaded in that field. All other file types must be prevented (Eg: image,video etc). How can I do that ?</p>