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# Directory Layout

The J executables j.exe and j.dll are installed in the main J directory, for example, c:\j406.

The following system subdirectories are created by the J installation:

System\Main | Main libraries and utilities
System\Packages | Packages (e.g. Stats, Printing)
System\Classes | Class definitions (e.g. Grid, Plot)
System\Extras | Various system utilities
System\Examples | Various Examples

In addition, two other subdirectories are created when J is installed:

User | User Definitions
Temp | Temporary files

Subdirectory Addons is created when one of the J Addons is installed.

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