IDLE built-in help in Linux vs Windows

[Paul Rubin]

In Windows if you click the Help dropdown, IDLE launches a help window
as it should.  The help contents are included in the installation.

In Linux, clicking Help launches a web browser, which is a perfectly
good UI for viewing help.  However, instead of loading a static HTML
file from the disk like the Windows version does, it visits the doc
directory on python.org over the internet.  

Is there any reason for that?  It's noticably slower even over
broadband, painful over dialup, and unusable if you're not connected
to the net at all.