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I don't think it's related to the mouse driver, it did the same thing before installing it, with a bluetooth mouse connected.
I change between window or fullscreen mode with the AGS config utility in the game folder. I've tested several commercial games, from different years, and they all behave the same.
I maximize with an external program since the window itself has the maximize button disabled. But considering it behaves the exact same way as when it is in fullscreen mode, I don't think that's the problem.
I will upload a video showing the behaviour. Considering it works in windowed mode, maybe it's not very difficult to make it work in fullscreen.

I wonder if there is any news about this.

AGS no longer requires mouse to be present, that's all that has changed. It still does not have any integrated touch screen support, which means that you must have mouse driver installed anyway to have cursor working.

With engine development practically stopped, I do not think there will be anything, unless someone takes on this job.

There is an ongoing work to finish ScummVM port for AGS, which in theory may improve situation to some degree, but it's too early to consider it an actual solution.

Thanks for answering.
Just out of curiosity, why do AGS games work pretty well with a touch screen when they are windowed and stop working properly when the window is maximized or in fullscreen mode?

I wonder if there is any news about this.

I am trying to play some AGS adventures on a tablet, and managed to bypass the "no mouse" error by installing Logitech Gaming Software, as it installs a virtual mouse driver. Seems a bit excessive (more than 300 MB for a tablet with very limited storage) but it's the only thing I could find that doesn't require a mouse at all.

After that, the games seems to work, but just when they are windowed. Resizing the window or play in full screen makes the pointer to not move according to the finger movement.

Also, I noticed in a particular game that it has a "agstouch.dll" file, but doesn't work properly in full screen mode either.