As operating systems have evolved, they have taken steps to separate programs/application files (that you presumably shouldn't touch) from "user data" such as saved games and custom files. For transparency, here is a breakdown of what files get installed where during an OOTP installation!
Program Files
Program or application files - those that are used to run the program, and should not be touched by users - are installed in the following directories:
| OS | Install Type | Program File Location | 
| Windows 7 | Default | Program Files (x86)Out of the Park DevelopmentsOOTP Baseball | 
| Windows 7 | Custom | The directory you chose during installation | 
| Windows Vista | Default | Program FilesOut of the Park DevelopmentsOOTP Baseball | 
| Windows Vista | Custom | The directory you chose during installation | 
| Windows XP | Default | Program FilesOut of the Park DevelopmentsOOTP Baseball | 
| Windows XP | Custom | The directory you chose during installation | 
| Macintosh | Default | ApplicationsOut of the Park DevelopmentsOOTP Baseball | 
| Macintosh | Custom | The directory you chose during installation | 
| Linux | Default | The directory that the install file resided in at the time of installation. This can be any directory than you placed the installer into after downloading it. | 
| Linux | Custom | The directory you chose during installation | 
User Data Files
User data files - those that are custom to the user, or can be customized - are installed in the following directories:
| OS | Install Type | User Data Location | 
| Windows 7 | Default | DocumentsOut of the Park DevelopmentsOOTP Baseball | 
| Windows 7 | Custom | The directory you chose during installation | 
| Windows Vista | Default | ? | 
| Windows Vista | Custom | The directory you chose during installation | 
| Windows XP | Default | My DocumentsOut of the Park DevelopmentsOOTP Baseball | 
| Windows XP | Custom | The directory you chose during installation | 
| Macintosh | Default | DocumentsOut of the Park DevelopmentsOOTP Baseball | 
| Macintosh | Custom | The directory you chose during installation | 
| Linux | Default | /home/(user name)/.Out of the Park Developments/OOTP Baseball/custdata | 
| Linux | Custom | The directory you chose during installation | 
Configuration Files
OOTP also has a few special 
configuration files that aren't required for normal usage of the game. These are placed in the following directory, which is hidden by default on all operating systems:
| OS | Install Type | Config File Location | 
| Windows 7 | Any | Users(username)AppDataRoamingOut of the Park DevelopmentsOOTP Baseballconfig | 
| Windows Vista | Any | Users(username)AppDataRoamingOut of the Park DevelopmentsOOTP Baseball | 
| Windows XP | Any | Documents and Settings(username)Application DataOut of the Park DevelopmentsOOTP Baseballconfig | 
| Macintosh | Any | ~/.Out of the Park Developments/OOTP Baseball/config | 
| Linux | Any | /home/(user name)/.Out of the Park Developments/OOTP Baseball/data/config/ |