restrict filetype, mime type for a doc type

Hi Gurus,

How can I restrict certain file type only (.pdf, .xlsx) and mime type for a document type ? Is there any standard way of doing this ?

If I look at standard config, document type allows all work statation applications that are defined can be attached to a document type.

Is it a development effort to restrict or do we have any std config solution. please help.

thanks

Devi