I have a working setup of plugin v1.1 and WMP 11 beta 2
(v 11.0.5705.5043) on Win XP pro with SP2 and .NET 2.0
(without .NET 1.x)
When playing files already in the library - through the
wmp interface - the progress slider is not present, and
the song length is not shown.
However, when dragging and dropping a file from
Explorer, the progress slider is present and active,
and tracks with the song's progress; song lengths are
loaded *upon play*
This happens irrespective of whether the files are
already in the library or not.
See also bug #1556240