By default, IIS will not serve up files without an extension. Never the less sometimes we need to allow IIS to serve up these files.
The following web.config file can be placed in the directory that you want to serve up these files from.
<?xml version="1.0" encoding="UTF-8"?>
<mimeMap fileExtension="." mimeType="*/*" />
The mimeType can be adjusted to allow a specific type of file to be downloaded from the server as well.