Hm... a program that was installed by the admin and that writes to its own folder (no other locations) is not having "system-wide" effects. Whether you can write to the mIRC folder or to the user data folder, you're still changing/writing the exact same file(s).

- Of course it's a system-wide effect, you're affecting all users on the machine when you write to anything in the Program Files folder.

Spelling mistakes, grammatical errors, and stupid comments are intentional.