You can use the portable mode to store all files in one directory (e.g. for use on a USB thumb drive) instead of the default directories listed below.
Windows XP, Server 2003
General settings:
C:\Documents and Settings\Username\Application Data\0install.net\injector
C:\Documents and Settings\All Users\Application Data\0install.net\injector
Interface-specific settings:
C:\Documents and Settings\Username\Application Data\0install.net\injector\interface
Feed-specific settings:
C:\Documents and Settings\Username\Application Data\0install.net\injector\feeds
Cached feeds:
C:\Documents and Settings\Username\Local Settings\Application Data\0install.net\interfaces
Cached implementations:
C:\Documents and Settings\Username\Local Settings\Application Data\0install.net\implementations
Custom locations (specified in C:\Documents and Settings\Username\Application Data\0install.net\injector\implementation-dirs)
C:\Documents and Settings\All Users\Application Data\0install.net\implementations
Desktop integration data:
C:\Documents and Settings\Username\Application Data\0install.net\desktop-integration
C:\Documents and Settings\All Users\Application Data\0install.net\desktop-integration
Windows Vista, 7, 8, Server 2008/2008 R2/2010
General settings:
C:\Users\Username\AppData\Roaming\0install.net\injector
C:\ProgramData\0install.net\injector
Interface-specific settings:
C:\Users\Username\AppData\Roaming\0install.net\injector\interfaces
Feed-specific settings:
C:\Users\Username\AppData\Roaming\0install.net\injector\feeds
Cached interfaces:
C:\Users\Username\AppData\Local\0install.net\interfaces
Cached implementations:
C:\Users\Username\AppData\Local\0install.net\implementations
Custom locations (specified in C:\Users\Username\AppData\Roaming\0install.net\injector\implementation-dirs)
C:\ProgramData\0install.net\implementations
Desktop integration data:
C:\Users\Username\AppData\Roaming\0install.net\desktop-integration
C:\ProgramData\0install.net\desktop-integration
Linux
General settings:
~/.config/0install.net/injector
/etc/xdg/0install.net/injector
Interface-specific settings:
~/.config/0install.net/injector/interfaces
Feed-specific settings:
~/.config/0install.net/injector/feeds
Cached interfaces:
~/.cache/0install.net/interfaces
Cached implementations:
~/.cache/0install.net/implementations
Custom locations (specified in ~/.config/0install.net/injector/implementation-dirs)
/var/cache/0install.net/implementations