It is common for programs to install files and folders in various locations on your system besides the Program Files/Program Files (x86) folder. This would include the AppData and ProgramData folders and Windows Registry.AppData
(Application data) is a hidden sub-folder used to protect user data and settings from unwanted changes or deletion for any number of installed programs. User data that was previously stored in the %SystemDrive%\Documents and Settings directory in Windows XP is now stored in the %SystemDrive%\Users directory (for Vista and above) which includes a AppData folder.
What is Application Data Folder in Windows 7
AppData or Application data is a hidden folder in Windows 7. It is to protect user data and settings from any unwanted change or deletion. It contains many important data such as program settings, IE cookies, toolbar settings, IE browsing history, temporary files created by applications, Libraries, send to items, templates and many more...To access this folder you have to select “Show hidden files and folders” in the folder options.
is a hidden folder that contains application data such as program settings and user data for installed programs.
What is the ProgramData Folder
ProgramData specifies the path to the program-data folder (normally C:\ProgramData). Unlike the Program Files folder, this folder can be used by applications to store data for standard users, because it does not require elevated permissions.
When uninstalling programs, it is not uncommon to find leftovers (remnants) in these areas as well as in Windows Registry since many program uninstallers do not perform an adequate job of completely removing them. How you deal with remnants depends on how clean you want your system.