The problem is that any way for you to sign files is also a way for malware to convince a less technically-adept user to sign it. Even if the dialogue that pops

The problem is that any way for you to sign files is also a way for malware to convince a less technically-adept user to sign it. Even if the dialogue that pops up for this says “Never ever do this unless you know exactly what you are doing, if a program you are running brought this up then it is probably trying to HACK you!”, people will click through it on autopilot and then maybe go ask what it meant afterwards.