Images explain it all.
EDIT: I managed to remove the symlinked folder weird stuff
Sorry, but no, not at all. Please elaborate.
Symlinked folder linking to itself caused a bunch of recursion. I don't know if mirc made it etc but I managed to remove it so all is fine, pretty weird though.
I don't know if mirc made it
Says it all.
No, mIRC didn't make it, given that the path points to a temporary directory in a non-user-writable disk location. Do a virus scan, because you may have one.
No virus was present, Anti-virus got one, and since it was mirc I found and nothing else that gives a bit of weight to what caused it, I certainly didn't find any other applications in there.
"Anti-virus got one"
What exactly does that mean?
Many viruses target mIRC specifically, and no other programs, which could explain how it was only mIRC. As a sidenote, it could just be nothing, as you're generally not supposed to be poking around ProgramData anyway, and as I mentioned, mIRC never puts itself there.
Do you run other people's scripts in your mirc?
It means I already have one my computer doesn't have a virus, I make all my own scripts and know my way around windows fairly well.
Do you run other people's scripts in your mirc?
No I only run my own scripts.
Managed to fix this the junction had messed up ACLs so obviously not mIRC's fault.
Glad to hear that you found the cause of this.