https://tmmm.forumotion.com/t927-if-you-download-map-and-you-can-get-virusThe link in the first post goes to the preload bug
And i talked about using it for more then just viruses, which seems is what your trying to do
The topic went down hill so i didnt post about it but i did do some experiments with it and found that its just not practical to use
Anyone with a decent firewall will see that its doing stuff in the background and will probably see it as a virus
Also it cant run the things it downloads
So, for example, if it dls something like a program that can rebind the keys so that q w e a s d are numpad 1 2 3 4 5 6 (so that items now work when you hit q w e a s or d) the user would have to tab out and start the program himself to get the different key bindings
And this bug is prety old, they may have patched it already
I dont think ive seen anything in the patch notes about it though