Prevent native windows popup?

Hello again.

I'm (still) making a program to prevent new apps to run, based on Software Restriction Policy.
However, when SRP is set, the new apps show a native windows popup saying the file was not found.

I know i can hide it when it shows, but is there a way to prevent it from showing or even to change its contents in a 'natural' way? Do i need a DLL for this?