The mimetypes module has a built-in default database, and, in addition, 
reads mime.types files from a list of standard places (/etc/mime.types 
by example)
On Windows, those files usually don't even present; MIME information is 
stored in the registry instead. Until now, the mimetypes module just 
ignored those settings; this patch adds support for reading the MIME 
database from the Windows registry.