jpackaged applications support both system-wide and per-user configuration.

jpackage application launcher will look up the corresponding `.cfg` file not only in the application installation directory (the system-wide installation location) but also in user-specific locations. User-specific directories for `.cfg` file look up are:

Linux
```
~/.local/${PACKAGE_NAME}
~/.${PACKAGE_NAME}
```
macOS
```
~/Library/Application Support/${PACKAGE_NAME}
```
Windows
```
%LocalAppData%\%PACKAGE_NAME%
%AppData%\%PACKAGE_NAME%
```
where `${PACKAGE_NAME}` and `%PACKAGE_NAME%` refer to jpackaged application name.