IDE Open bug ( opens multiple instances )

What steps will reproduce the problem?

1. Start with no IDE instances open.
2. Open IDE from start menu or short cut ( not .ino or .pde ), so it opens an 
empty new sketch.
3. Use the GUI button 'Open' to select one of the recently used sketches.
 At this point only one instance is running with the selected sketch open.
4. Find a .ino file anywhere on your computer, click to open it.
Now you have two copies of the first sketch open and one newly opened sketch.

What is the expected output? What do you see instead?
Opens two IDE instances, one of an already loaded sketch and one of the newly 
'opened' sketch

What version of the Arduino software are you using? On what operating
system?  Which Arduino board are you using?
IDE: 1.0
BOARDS: UNO, Mega
OS: Windows 7, but verified bug on Windows XP SP3

http://arduino.cc/forum/index.php/topic,92376.0.html

Original issue reported on code.google.com by Andrews...@gmail.com on 1 Mar 2012 at 12:59

anilgkts / arduino

IDE Open bug ( opens multiple instances ) #837