title: Neither ruby and nor irb can load .rb file in current directory
body: <p>I'm having a really noob problem with importing files in Ruby. I'm making a Ruby app in Windows XP. All the class files for the app are in <code>"C:/Documents/Prgm/Surveyor_Ruby/lib"</code>. But when I <code>require</code> a file in another file, neither ruby nor irb can find the required file.</p>
  
  <p>The current directory's contents:</p>
  
  <pre><code>C:\Documents\Prgm\Surveyor_Ruby\lib&gt;dir
   Volume in drive C has no label.
   Volume Serial Number is AAAA-BBBB
  
   Directory of C:\Documents\Prgm\Surveyor_Ruby\lib
  
  10/09/2010  06:32 PM    &lt;DIR&gt;          .
  10/09/2010  06:32 PM    &lt;DIR&gt;          ..
  10/08/2010  03:22 PM             5,462 main (commented).rb
  10/08/2010  03:41 PM                92 question.rb
  10/08/2010  09:06 PM             2,809 survey.rb
  10/09/2010  06:25 PM               661 surveyor.rb
  10/08/2010  01:39 PM             1,546 test.rb
                 5 File(s)         10,570 bytes
                 2 Dir(s)  40,255,045,632 bytes free
  </code></pre>
  
  <p>Confirmation that irb is in correct directory:</p>
  
  <pre><code>C:\Documents\Prgm\Surveyor_Ruby\lib&gt;irb
  irb(main):001:0&gt; Dir.pwd
  =&gt; "C:/Documents/Prgm/Surveyor_Ruby/lib"
  </code></pre>
  
  <p>...yet irb can't load survey.rb:</p>
  
  <pre><code>irb(main):002:0&gt; require 'survey'
  LoadError: no such file to load -- survey
          from &lt;internal:lib/rubygems/custom_require&gt;:29:in `require'
          from &lt;internal:lib/rubygems/custom_require&gt;:29:in `require'
          from (irb):2
          from C:/Ruby192/bin/irb:12:in `&lt;main&gt;'
  </code></pre>