Two Instances of Unity3d

Notice: Recent version of Unity automatically support multiple editor instances, so this trick is no longer necessary.

If you want to conveniently open up a second instance of the Unity editor follow these steps:


 * 1) Right click on your desktop (or any directory for that matter) and choose New > Shortcut.
 * 2) When the "Create Shortcut" dialog appears click Browse
 * 3) Navigate to the Unity.exe file and click Okay. The default directory for this on a 64 bit PC is C:\Program Files (x86)\Unity\Editor
 * 4) Click "Next" and type in whatever name you want yours to be, I call mine "Unity Project". Click Finish.
 * 5) Right click on the shortcut you made and go Properties.
 * 6) In the "Shortcut" tab under the Target section it will read "C:\Program Files (x86)\Unity\Editor\Unity.exe". You will want to change that to "C:\Program Files (x86)\Unity\Editor\Unity.exe" -projectPath
 * 7) Click Okay and when you open up that shortcut it will give you an option to pick what project you want to open.
 * 8) Clear the Error it will give you at the bottom of the screen within Unity3d

On windows 7, you can also right click on the unity icon on the taskbar and click on 'Unity'. This will open another unity window for you, so you can have 2 projects open at once.