You should use only one mirc.exe and only run multiple instances using the "-i" switch on the command line (for your own usage), or mirc.inis in the user default
I disagree. I currently have 7 different folders
for 7 different users on one of the computers in my house (running Windows7 and all are mIRC6.35). Each folder has it's own mirc-username.exe (copied from an install folder that is not used), and all of these copies have their own settings, and scripts. NONE of them use the AppData folder, as all are created in the root directory (C:\mirc-username for each).