Answer
The location of the PLTS.ini file is different depending upon the operating system installed and how it was initially set up.
Windows VISTA
C:\Users\(user folder)\AppData\Roaming
Windows 2000 and XP
C:\Documents and Settings\(users folder)\Application Data
Windows NT
C:\WINNT\Profiles\(users folder)\Application Data
Article ID:000005631
Software:
- ArcGIS Production Mapping 9 x