user3219: After installing IDE 1.5.6r2, there are two .exe files, arduino_debug.exe and arduino.exe (which is same name as previously installed IDE 1.0.5). 

user27: Windows binaries can either be Window or Console applications. A Window application can NOT produce text output. Text output is the easiest way to gather error messages related to bugs.
Hence, arduino_debug.exe should be used by Windows users that have found a bug in the Arduino IDE and wish to contribute submitting an issue on github.

3219: <p>After installing IDE 1.5.6r2, there are two .exe files, <strong>arduino_debug</strong>.exe and <strong>arduino</strong>.exe (which is same name as previously installed IDE 1.0.5). </p>
 27: <p>Windows binaries can either be Window or Console applications. A Window application can NOT produce text output. Text output is the easiest way to gather error messages related to bugs.</p>

<p>Hence, <code>arduino_debug.exe</code> should be used by Windows users that have found a bug in the Arduino IDE and wish to contribute submitting an <a href="https://github.com/arduino/Arduino/issues" rel="nofollow">issue on github</a>.</p>
