Rainbowduino Firmware update problem

[jmr]

The .hex file is the final output of the compilation which is then uploaded to the board. During a “Verify” the .hex file is written to /tmp (on Mac and Linux) or \Documents and Settings<USER>\Local Settings\Temp (on Windows). During upload, it’s written to the applet sub-directory of the sketch directory (which you can open with the “Show Sketch Folder” item in the Sketch menu).

siehe http://www.arduino.cc/en/Hacking/BuildProcess