IO.popen in windows ignores pwd

viz:

>> Dir.pwd
=> "C:/Program Files (x86)/VideoLAN/VLC"
>> Dir['*.exe']
=> ["uninstall.exe", "vlc-cache-gen.exe", "vlc.exe"]
>> IO.popen("vlc.exe c:
silence").pid
=> 728 # works, though wrong pid, but that's for a different JIRA
>> IO.popen("vlc.exe").pid
IOError: Cannot run program "vlc.exe" (in directory "C:\Program Files (x86)\VideoLAN\VLC"): CreateProcess error=2, The system cannot find the file specified
from org/jruby/RubyIO.java:3702:in `popen'
from (irb):29:in `evaluate'
from org/jruby/RubyKernel.java:1087:in `eval'
from g:/installs/jruby-1.6.0/lib/ruby/1.8/irb.rb:158:in `eval_input'
from g:/installs/jruby-1.6.0/lib/ruby/1.8/irb.rb:271:in `signal_status'
from g:/installs/jruby-1.6.0/lib/ruby/1.8/irb.rb:270:in `signal_status'
from g:/installs/jruby-1.6.0/lib/ruby/1.8/irb.rb:155:in `eval_input'
from org/jruby/RubyKernel.java:1417:in `loop'
from org/jruby/RubyKernel.java:1190:in `catch'
from g:/installs/jruby-1.6.0/lib/ruby/1.8/irb.rb:154:in `eval_input'
from g:/installs/jruby-1.6.0/lib/ruby/1.8/irb.rb:71:in `start'
from org/jruby/RubyKernel.java:1190:in `catch'
from g:/installs/jruby-1.6.0/lib/ruby/1.8/irb.rb:70:in `start'
from g:/installs/jruby-1.6.0/bin/jirb:13:in `(root)'

The last failure is surprising, and isn't how MRI acts.

Cheers!