How to reproduce

1. Install 6u10.

2. Lock some of the 6u10 JRE files by running applications such as Bugster (open 3-4 bugster windows)

3. Uninstall 6u10 offline. You will see "Files in Use" dialog. It only shows one entry in the list for all the windows which have same name.

4. Click the "Ignore" button. Though uninstallation goes fine but it may cause failure in subsequent install/unistall.

Issue 1:
"Files in Use" dialog only shows one entry in the list for all the windows which have same name. Where as it should show one entry for each window.

Issue 2:
Ignore button should be removed from the "Files in Use" dialog during unistallation as well. It will make sure that we have clean uninstallation and installation for the subsequent attempt.
Fixed by invoking our custom version of FilesInUse before MSI's default version (the one that includes problematic 'ignore' buttom).