Appears that on doze both jruby.bat and jruby.exe are provided–is that
expected? (in the end, only jruby.exe ever gets run, I believe).
Also, I did note that the installer installs to an old version number.
jruby 1.4.0RC2 (ruby 1.8.7 patchlevel 174) (2009-10-21 7e77f32) (Java
HotSpot™ Client VM 1.6.0_13) [x86-java]