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Raja Bhandari 16Raja Bhandari 16 

Urgent Help: Restrict File Extension on upload from chatter and FileRelated List on Account amd contact only.

Raja Bhandari 16Raja Bhandari 16
I was expecting some answer..
RahulRahul
From Setup, enter File Upload and Download Security in the Quick Find box, then select File Upload and Download Security.
Click Edit.
To prevent users from uploading files that can pose a security risk, select Don't allow HTML uploads as attachments or document records.
This setting blocks the upload of these MIME file types: .html, .htt, .mht, .svg, .swf, .thtml, and .xhtml.