This program is needed to visually enlarge the area under the cursor in order to zoom in on a specific pixel on a sprite in GTAcars (assuming the cursor is hovered over the sprite). In the future, it will be easier to fix dead pixels if you messed up the sprite. When you run this program, click on the "zoom factor" to change the zoom, and you will see a zoomed-in cursor over the sprites in GTAcars.
To turn off the enlarged display in the window (but without turning off GTAcars Zoom Extention itself), click on "move zoom to gtacars". To re-enable the enlarged display, click "zoom back to this program". Unfortunately, GTAcars itself did not have time to implement this, so this utility was released by another developer separately from the main program.