Qt Installer Framework - Update control script

Question

The problem

I have a Qt IFW installer with an online repository, from which users fetch data to install and update the software.

My installer has a "root script" defined in config.xml:

<Installer>
    <!-- ... -->
    <ControlScript>controllerscript.qs</ControlScript>
</Installer>

Now I want to change the content of controllerscript.qs and deploy it on the online repository.

• when a new user installs the software for the first time, it works as expected
• when a user updates its software from a previous version using MaintenanceTool.exe, it does not get the update

Possible solution

I realized that when you create the installer, it generates a file named MaintenanceTool.dat which seems to contain controllerscript.qs (+ other things). I managed to manually copy that file and push it to the online repository (inside a package). That way, the maintenance tool is able to see the package update, and correctly gets the new MaintenanceTool.dat. After that, the maintenance tool is indeed using the new code from controllerscript.qs.

Question

• Is there another (cleaner) way to achieve that?
• If not, is it really safe to provide a manual update to MaintenanceTool.dat? That file contains many other things, so is there a risk to interfere with the rest?

Thanks,