When previewing images, 'CTRL + scrollwheel' can be used for zooming in/out. Just like the two buttons in the preview header.
With textfiles (CMD, INI, REG, etc.) 'CTRL + scrollwheel' does not zoom.
The two buttons still work; setting the default fontsize too.
Documentation is not conclusive. Should 'CTRL + scrollwheel' work on textfiles too?
And should 'ALT + scrollwheel' scroll horizontally?