Thanks. I was able to put the code in but did not help
much. For example, I
uploaded a file called Test.xls on my Wiki:
http://wiki.koolsolutions.com/index.php?title=File:TestFile.xls
But when I click on the link "Edit this file using an external application",
all I get is a Firefox Download box (I am using Windows Machine) for
index.php instead. How I can edit this excel file in place using MS Excel
which is installed on my system.
You need a program registered to handle application/x-external-editor
mime types which can launch Excel for you (and upload the modified file
afterwards). See