Hi, you can get most informations by using the files from "C:\ProgramData\QlikTech\ManagementService".
To show Task from the past you can read the Logfiles. You can also use the QMSAPI, if you use it you can automate nearly all options from the qmc and you can read all informations of the qlikview enviroment.
Our good friend Rob Wunderlich has an excellent QlikView application that scans and reports on the Publisher repository (QVPR).
It's called QVPR Analysis and is available at his QlikView Cookbook site here http://qlikviewcookbook.com/tools/
You can then view your publisher repository in QlikView and (if you really must) export it to Excel.