extension point to listen for opened files

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Open a file.xmind in xmind, xmind pro, or other 3rd party product
2. Be aware of open workbooks to add additional functionality to them

What is the expected output? What do you see instead?

I would like to access a workbook, without having to have a custom "open file 
in extended mode" option.

What version of the product are you using? On what operating system?
xmind 3.2.1 ubuntu

Please provide any additional information below.

I am new to eclipse plugin, but it seems the only way to have access to a 
workbook is to have a specific file open handler.

I would like my tool to be aware of any open workbook and to be able to 
integrate with other plugins.

I *think* this would be achieved by exposing a file open / download listener as 
an extension point. This will mean multiple feature-plugins can run at the same 
time, which can only be a good thing :-)

Original issue reported on code.google.com by innocent...@gmail.com on 30 Jul 2011 at 12:03