In folder options -> view, there's an option that's off by default called "Launch folder windows in a separate process". I'm on windows-7, but I know this capability has existed since at least windows xp.

When is it advantageous to do this? When does this option improve performance? Are there any other considerations to take into account before using this option?

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the main reason i would suggest turning this on is so that if you have a folder window open which stops responding and you kill the task, it won't/shouldn't take the main explorer.exe with it (meaning your desktop won't be inaccessible for a few moments while windows restarts it).

I am unsure what advantage there would be to not having it enabled other than not using as much memory.

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I find this useful when I want to go back and forth between any number of folders, for example when I want to copy or move between folders. The only problem I have found is that sometimes I can have too many folders open, and then I have to close some so there is less confusion as to what is where.

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What difference does having separate processes make in this situation? I do this with this option off and never had any issue. – Shinrai Nov 26 '10 at 16:43
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"Launch folder windows in a separate process" does not mean "Open each folder in its own window". – Lawrence Velázquez Nov 26 '10 at 17:40
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See this article for turning this option on or off:
Vista - Open a Folder in the Same or Separate New Window.

Getting this option to actually work is a non-trivial exercise. For example, one cannot use "Always Open the Folder in its Own Separate New Window" if one doesn't turn off the Navigation Pane.

You should only use this option if you like having lots of folder windows being launched whenever you move between folders. I suppose that it is good for target-practicing on the close-button, or whatever.

This is one of the most useless options in Windows, designed apparently to prevent you from looking at too many folders without a really good reason.

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