Windows

• Default Location

C:\Users\UserName\AppData

• Environment variable

Process / Thread - Environment Variable

 %APPDATA% 

• Structure

The appdata folders contains three subfolders

C:\Users\UserName\AppData
                           \Local
                            \LocalLow
                            \Roaming 

where:

• local contains data that will stay on the computer (cache, big file..
• localLow contains data that may be used even in Protected mode (with more restricted security settings)
• roaming is the data that would roam (ie sync from computer to computer) after a user login on the same domain

Linux

• The appdata equivalent for linux is a hidden home sub-directory with the name of the application

~/.appName

where:

• ~ is a shortcut for home