Erroneous output from ri File

[Eric Christopherson]

I mentioned this in another thread, but didn't get an answer.

For me, under 1.9.1p429 (RubyInstaller) under Windows, ri File says only this:

(begin)
------------------------------------------------------- Class: File < IO
[no description]
------------------------------------------------------------------------


Class methods:
--------------

binread
(end)

ri IO shows:
(begin)
More than one method matched your request. You can refine your
search by asking for information on one of:

TkItemConfigMethod::__IGNORE_UNKNOWN_CONFIGURE_OPTION__ [gem tk_as_gem-0.1.0]
TkItemConfigMethod::__set_IGNORE_UNKNOWN_CONFIGURE_OPTION__! [gem
tk_as_gem-0.1.0]
(end)

Is something missing from my Ruby installation?