[windows] `"dir" .` throws java.lang.IllegalArgumentException
-------------------------------------------------------------

                 Key: JRUBY-4127
                 URL: http://jira.codehaus.org/browse/JRUBY-4127
             Project: JRuby
          Issue Type: Bug
          Components: Windows
    Affects Versions: JRuby 1.4.0RC1
            Reporter: Vladimir Sizikov


Create a file, say, cmd.rb

{code:title=cmd.rb|borderStyle=solid}
print `"dir" .`
{code}

Then:
{code}
#> jruby cmd.rb
ProcessImpl.java:69:in `<init>': java.lang.IllegalArgumentException
        from ProcessImpl.java:30:in `start'
        from ProcessBuilder.java:452:in `start'
        from Runtime.java:593:in `exec'
        from ShellLauncher.java:677:in `run'
        from ShellLauncher.java:238:in `runAndWait'
        from RubyKernel.java:1305:in `backquote'
        from org/jruby/RubyKernel$s_method_1_0$RUBYINVOKER$backquote.gen:-1:in 
`call'
        from CachingCallSite.java:310:in `cacheAndCall'
        from CachingCallSite.java:149:in `call'
        from cmd.rb:1:in `__file__'
        from cmd.rb:-1:in `load'
        from Ruby.java:628:in `runScript'
        from Ruby.java:550:in `runNormally'
        from Ruby.java:396:in `runFromMain'
        from Main.java:272:in `run'
        from Main.java:117:in `run'
        from Main.java:97:in `main'
{code}

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