HTML form: file requestor to show only specific extensions?

I included an upload page in my web application via a HTML form. When pressing the browse button, the file requestor shows all files in the given directory. Is it possible to set up the form so that the file requestor only shows specific file types (e.g. only extensions ".zip") - just like the file filters in JFileChooser?

[331 byte] By [MartinHilperta] at [2007-10-2 5:55:51]