When having customers upload a file, it would be beneficial to have the file types restricted. For example, on a form for employment, we would like to restrict to only PDF files. Reason being is that Office files, Word or Excel allow macros that can contain that execute on the workstation. By only having PDF files, that would make our users safer, in that it lessens the possiblilty for virus' to be introduced into our systems.
There are many other scenarios where restricting the file upload type would be beneficial.
