It was a dark and stormy night when jo said:
Is there an idiot proof way of making it so that when I double
click on a folder it will open with another file manager?
2xExplorer's FAQ contains an article related to your question:
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Q15. How can I make 2xExplorer the default application for all my
folders?
A. I wouldn't recommend replacing the standard explorer altogether,
but it's very easy to add a "verb" that will give you the chance to
open folders with 2xExplorer. From explorer edit the "File Type"
associations (View | Folder Options | File Types tab). It's not very
intuitive, but if you scroll down you'll find a Folder "file type",
which you can Edit as usual. Create a new verb e.g. "2xOpen" and edit
its action. This should have
"c:\YourPath\2xExplorer.exe" "%1"
as the new command line (including the quotation marks, too). Now
whenever you right click on a folder, there's going to be a "2xOpen"
item in the context menu.
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Follow the instructions replacing "c:\YourPath\2xExplorer.exe" with
the path of your file manager and don't forget to click on the 'Set
Default' button.
For anyone interested the full FAQ is located here:
<
http://netez.com/2xExplorer/faq.html>
HTH