user-1: I have an Arduino Yún running Openwrt-Yún 1.5.3 (which is the latest version, as I upgraded yesterday), and I am trying to obtain a .hex (compiled sketch), so that I can upload a sketch directly into the Yún. I know about compiled sketches, but there are no build directories in "C:\Documents and Settings\MY_USERNAME\Local Settings\Temp".
Where can I obtain the .hex of any file I have compiled, and how?

user3917: As noted in comments, enable verbose compilation and look at the output to find the temporary-directory location. (Click File, Preferences, verbose compilation.)
Note, after you click File, Preferences and the preferences window appears with its half-dozen items, you should also see a note about directly editing preferences in the preferences.txt file.  Edit that file (using a plain-text editor, not a word processor) when the arduino IDE is not running.  Change the line 
preproc.save_build_files=false

to 
preproc.save_build_files=true

so the .hex files in the temporary directory have a better chance of sticking around.  
(I'm not able to test this suggestion on an MS-Windows system.  On my Linux system most build files stick around anyway in /tmp/)

-1: <p>I have an Arduino Yún running Openwrt-Yún 1.5.3 (which is the latest version, as I upgraded yesterday), and I am trying to obtain a .hex (compiled sketch), so that I can upload a sketch directly into the Yún. I know about compiled sketches, but there are no build directories in "C:\Documents and Settings\MY_USERNAME\Local Settings\Temp".</p>

<p>Where can I obtain the .hex of any file I have compiled, and how?</p>
 3917: <p>As noted in comments, enable verbose compilation and look at the output to find the temporary-directory location. (Click File, Preferences, verbose compilation.)</p>

<p>Note, after you click File, Preferences and the preferences window appears with its half-dozen items, you should also see a note about directly editing preferences in the preferences.txt file.  Edit that file (using a plain-text editor, not a word processor) when the arduino IDE is not running.  Change the line </p>

<pre><code>preproc.save_build_files=false
</code></pre>

<p>to </p>

<pre><code>preproc.save_build_files=true
</code></pre>

<p>so the .hex files in the temporary directory have a better chance of sticking around.  </p>

<p>(I'm not able to test this suggestion on an MS-Windows system.  On my Linux system most build files stick around anyway in /tmp/)</p>
